/* * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* * Copyright (c) 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vfs_cluster.c 8.10 (Berkeley) 3/28/95 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define CL_READ 0x01 #define CL_ASYNC 0x02 #define CL_COMMIT 0x04 #define CL_PAGEOUT 0x10 #define CL_AGE 0x20 #define CL_DUMP 0x40 #define CL_NOZERO 0x80 #define CL_PAGEIN 0x100 #define CL_DEV_MEMORY 0x200 #define CL_PRESERVE 0x400 #define CL_THROTTLE 0x800 struct clios { u_int io_completed; /* amount of io that has currently completed */ u_int io_issued; /* amount of io that was successfully issued */ int io_error; /* error code of first error encountered */ int io_wanted; /* someone is sleeping waiting for a change in state */ }; static void cluster_zero(upl_t upl, vm_offset_t upl_offset, int size, struct buf *bp); static int cluster_read_x(struct vnode *vp, struct uio *uio, off_t filesize, int devblocksize, int flags); static int cluster_write_x(struct vnode *vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t headOff, off_t tailOff, int devblocksize, int flags); static int cluster_nocopy_read(struct vnode *vp, struct uio *uio, off_t filesize, int devblocksize, int flags); static int cluster_nocopy_write(struct vnode *vp, struct uio *uio, off_t newEOF, int devblocksize, int flags); static int cluster_phys_read(struct vnode *vp, struct uio *uio, off_t filesize, int devblocksize, int flags); static int cluster_phys_write(struct vnode *vp, struct uio *uio, off_t newEOF, int devblocksize, int flags); static int cluster_align_phys_io(struct vnode *vp, struct uio *uio, addr64_t usr_paddr, int xsize, int devblocksize, int flags); static int cluster_push_x(struct vnode *vp, off_t EOF, unsigned int first, unsigned int last, int can_delay); static int cluster_try_push(struct vnode *vp, off_t EOF, int can_delay, int push_all); static int sparse_cluster_switch(struct vnode *vp, off_t EOF); static int sparse_cluster_push(struct vnode *vp, off_t EOF, int push_all); static int sparse_cluster_add(struct vnode *vp, off_t EOF, daddr_t first, daddr_t last); static kern_return_t vfs_drt_mark_pages(void **cmapp, off_t offset, u_int length, int *setcountp); static kern_return_t vfs_drt_unmark_pages(void **cmapp, off_t offset, u_int length); static kern_return_t vfs_drt_get_cluster(void **cmapp, off_t *offsetp, u_int *lengthp); static kern_return_t vfs_drt_control(void **cmapp, int op_type); int ubc_page_op_with_control __P((memory_object_control_t, off_t, int, ppnum_t *, int *)); /* * throttle the number of async writes that * can be outstanding on a single vnode * before we issue a synchronous write */ #define ASYNC_THROTTLE 18 #define HARD_THROTTLE_MAXCNT 1 #define HARD_THROTTLE_MAXSIZE (64 * 1024) int hard_throttle_on_root = 0; struct timeval priority_IO_timestamp_for_root; static int cluster_hard_throttle_on(vp) struct vnode *vp; { static struct timeval hard_throttle_maxelapsed = { 0, 300000 }; if (vp->v_mount->mnt_kern_flag & MNTK_ROOTDEV) { struct timeval elapsed; if (hard_throttle_on_root) return(1); elapsed = time; timevalsub(&elapsed, &priority_IO_timestamp_for_root); if (timevalcmp(&elapsed, &hard_throttle_maxelapsed, <)) return(1); } return(0); } static int cluster_iodone(bp) struct buf *bp; { int b_flags; int error; int total_size; int total_resid; int upl_offset; int zero_offset; upl_t upl; struct buf *cbp; struct buf *cbp_head; struct buf *cbp_next; struct buf *real_bp; struct vnode *vp; struct clios *iostate; int commit_size; int pg_offset; cbp_head = (struct buf *)(bp->b_trans_head); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_START, (int)cbp_head, bp->b_lblkno, bp->b_bcount, bp->b_flags, 0); for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) { /* * all I/O requests that are part of this transaction * have to complete before we can process it */ if ( !(cbp->b_flags & B_DONE)) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, (int)cbp_head, (int)cbp, cbp->b_bcount, cbp->b_flags, 0); return 0; } } error = 0; total_size = 0; total_resid = 0; cbp = cbp_head; upl_offset = cbp->b_uploffset; upl = cbp->b_pagelist; b_flags = cbp->b_flags; real_bp = cbp->b_real_bp; vp = cbp->b_vp; zero_offset= cbp->b_validend; iostate = (struct clios *)cbp->b_iostate; while (cbp) { if ((cbp->b_flags & B_ERROR) && error == 0) error = cbp->b_error; total_resid += cbp->b_resid; total_size += cbp->b_bcount; cbp_next = cbp->b_trans_next; free_io_buf(cbp); cbp = cbp_next; } if (zero_offset) cluster_zero(upl, zero_offset, PAGE_SIZE - (zero_offset & PAGE_MASK), real_bp); if ((vp->v_flag & VTHROTTLED) && (vp->v_numoutput <= (ASYNC_THROTTLE / 3))) { vp->v_flag &= ~VTHROTTLED; wakeup((caddr_t)&vp->v_numoutput); } if (iostate) { /* * someone has issued multiple I/Os asynchrounsly * and is waiting for them to complete (streaming) */ if (error && iostate->io_error == 0) iostate->io_error = error; iostate->io_completed += total_size; if (iostate->io_wanted) { /* * someone is waiting for the state of * this io stream to change */ iostate->io_wanted = 0; wakeup((caddr_t)&iostate->io_wanted); } } if ((b_flags & B_NEED_IODONE) && real_bp) { if (error) { real_bp->b_flags |= B_ERROR; real_bp->b_error = error; } real_bp->b_resid = total_resid; biodone(real_bp); } if (error == 0 && total_resid) error = EIO; if (b_flags & B_COMMIT_UPL) { pg_offset = upl_offset & PAGE_MASK; commit_size = (pg_offset + total_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (error || (b_flags & B_NOCACHE)) { int upl_abort_code; if ((b_flags & B_PAGEOUT) && (error != ENXIO)) /* transient error */ upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; else if (b_flags & B_PGIN) upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR; else upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_DUMP_PAGES; ubc_upl_abort_range(upl, upl_offset - pg_offset, commit_size, upl_abort_code); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, (int)upl, upl_offset - pg_offset, commit_size, 0x80000000|upl_abort_code, 0); } else { int upl_commit_flags = UPL_COMMIT_FREE_ON_EMPTY; if (b_flags & B_PHYS) { if (b_flags & B_READ) upl_commit_flags |= UPL_COMMIT_SET_DIRTY; } else if ( !(b_flags & B_PAGEOUT)) upl_commit_flags |= UPL_COMMIT_CLEAR_DIRTY; if (b_flags & B_AGE) upl_commit_flags |= UPL_COMMIT_INACTIVATE; ubc_upl_commit_range(upl, upl_offset - pg_offset, commit_size, upl_commit_flags); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, (int)upl, upl_offset - pg_offset, commit_size, upl_commit_flags, 0); } } else KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, (int)upl, upl_offset, 0, error, 0); return (error); } static void cluster_zero(upl, upl_offset, size, bp) upl_t upl; vm_offset_t upl_offset; int size; struct buf *bp; { upl_page_info_t *pl; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 23)) | DBG_FUNC_START, upl_offset, size, (int)bp, 0, 0); if (bp == NULL || bp->b_data == NULL) { pl = ubc_upl_pageinfo(upl); while (size) { int page_offset; int page_index; addr64_t zero_addr; int zero_cnt; page_index = upl_offset / PAGE_SIZE; page_offset = upl_offset & PAGE_MASK; zero_addr = ((addr64_t)upl_phys_page(pl, page_index) << 12) + page_offset; zero_cnt = min(PAGE_SIZE - page_offset, size); bzero_phys(zero_addr, zero_cnt); size -= zero_cnt; upl_offset += zero_cnt; } } else bzero((caddr_t)((vm_offset_t)bp->b_data + upl_offset), size); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 23)) | DBG_FUNC_END, upl_offset, size, 0, 0, 0); } static int cluster_io(vp, upl, upl_offset, f_offset, non_rounded_size, devblocksize, flags, real_bp, iostate) struct vnode *vp; upl_t upl; vm_offset_t upl_offset; off_t f_offset; int non_rounded_size; int devblocksize; int flags; struct buf *real_bp; struct clios *iostate; { struct buf *cbp; u_int size; u_int io_size; int io_flags; int error = 0; int retval = 0; struct buf *cbp_head = 0; struct buf *cbp_tail = 0; int buf_count = 0; int pg_count; int pg_offset; u_int max_iosize; u_int max_vectors; int priv; int zero_offset = 0; int async_throttle; if (devblocksize) size = (non_rounded_size + (devblocksize - 1)) & ~(devblocksize - 1); else size = non_rounded_size; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_START, (int)f_offset, size, upl_offset, flags, 0); if (flags & CL_READ) { io_flags = (B_VECTORLIST | B_READ); vfs_io_attributes(vp, B_READ, &max_iosize, &max_vectors); } else { io_flags = (B_VECTORLIST | B_WRITEINPROG); vfs_io_attributes(vp, B_WRITE, &max_iosize, &max_vectors); } /* * make sure the maximum iosize are at least the size of a page * and that they are multiples of the page size */ max_iosize &= ~PAGE_MASK; if (flags & CL_THROTTLE) { if ( !(flags & CL_PAGEOUT) && cluster_hard_throttle_on(vp)) { if (max_iosize > HARD_THROTTLE_MAXSIZE) max_iosize = HARD_THROTTLE_MAXSIZE; async_throttle = HARD_THROTTLE_MAXCNT; } else async_throttle = ASYNC_THROTTLE; } if (flags & CL_AGE) io_flags |= B_AGE; if (flags & CL_DUMP) io_flags |= B_NOCACHE; if (flags & CL_PAGEIN) io_flags |= B_PGIN; if (flags & CL_PAGEOUT) io_flags |= B_PAGEOUT; if (flags & CL_COMMIT) io_flags |= B_COMMIT_UPL; if (flags & CL_PRESERVE) io_flags |= B_PHYS; if ((flags & CL_READ) && ((upl_offset + non_rounded_size) & PAGE_MASK) && (!(flags & CL_NOZERO))) { /* * then we are going to end up * with a page that we can't complete (the file size wasn't a multiple * of PAGE_SIZE and we're trying to read to the end of the file * so we'll go ahead and zero out the portion of the page we can't * read in from the file */ zero_offset = upl_offset + non_rounded_size; } while (size) { int vsize; int i; int pg_resid; int num_contig; daddr_t lblkno; daddr_t blkno; if (size > max_iosize) io_size = max_iosize; else io_size = size; if (error = VOP_CMAP(vp, f_offset, io_size, &blkno, (size_t *)&io_size, NULL)) { if (error == EOPNOTSUPP) panic("VOP_CMAP Unimplemented"); break; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 24)) | DBG_FUNC_NONE, (int)f_offset, (int)blkno, io_size, zero_offset, 0); if ( (!(flags & CL_READ) && (long)blkno == -1) || io_size == 0) { if (flags & CL_PAGEOUT) { error = EINVAL; break; }; /* Try paging out the page individually before giving up entirely and dumping it (it could be mapped in a "hole" and require allocation before the I/O: */ ubc_upl_abort_range(upl, upl_offset, PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY); if (ubc_pushdirty_range(vp, f_offset, PAGE_SIZE_64) == 0) { error = EINVAL; break; }; f_offset += PAGE_SIZE_64; upl_offset += PAGE_SIZE; size -= PAGE_SIZE; continue; } lblkno = (daddr_t)(f_offset / PAGE_SIZE_64); /* * we have now figured out how much I/O we can do - this is in 'io_size' * pg_offset is the starting point in the first page for the I/O * pg_count is the number of full and partial pages that 'io_size' encompasses */ pg_offset = upl_offset & PAGE_MASK; if (flags & CL_DEV_MEMORY) { /* * currently, can't deal with reading 'holes' in file */ if ((long)blkno == -1) { error = EINVAL; break; } /* * treat physical requests as one 'giant' page */ pg_count = 1; } else pg_count = (io_size + pg_offset + (PAGE_SIZE - 1)) / PAGE_SIZE; if ((flags & CL_READ) && (long)blkno == -1) { int bytes_to_zero; /* * if we're reading and blkno == -1, then we've got a * 'hole' in the file that we need to deal with by zeroing * out the affected area in the upl */ if (zero_offset && io_size == size) { /* * if this upl contains the EOF and it is not a multiple of PAGE_SIZE * than 'zero_offset' will be non-zero * if the 'hole' returned by VOP_CMAP extends all the way to the eof * (indicated by the io_size finishing off the I/O request for this UPL) * than we're not going to issue an I/O for the * last page in this upl... we need to zero both the hole and the tail * of the page beyond the EOF, since the delayed zero-fill won't kick in */ bytes_to_zero = (((upl_offset + io_size) + (PAGE_SIZE - 1)) & ~PAGE_MASK) - upl_offset; zero_offset = 0; } else bytes_to_zero = io_size; cluster_zero(upl, upl_offset, bytes_to_zero, real_bp); if (cbp_head) /* * if there is a current I/O chain pending * then the first page of the group we just zero'd * will be handled by the I/O completion if the zero * fill started in the middle of the page */ pg_count = (io_size - pg_offset) / PAGE_SIZE; else { /* * no pending I/O to pick up that first page * so, we have to make sure it gets committed * here. * set the pg_offset to 0 so that the upl_commit_range * starts with this page */ pg_count = (io_size + pg_offset) / PAGE_SIZE; pg_offset = 0; } if (io_size == size && ((upl_offset + io_size) & PAGE_MASK)) /* * if we're done with the request for this UPL * then we have to make sure to commit the last page * even if we only partially zero-filled it */ pg_count++; if (pg_count) { if (pg_offset) pg_resid = PAGE_SIZE - pg_offset; else pg_resid = 0; if (flags & CL_COMMIT) ubc_upl_commit_range(upl, (upl_offset + pg_resid) & ~PAGE_MASK, pg_count * PAGE_SIZE, UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY); } upl_offset += io_size; f_offset += io_size; size -= io_size; if (cbp_head && pg_count) goto start_io; continue; } else if (real_bp && (real_bp->b_blkno == real_bp->b_lblkno)) { real_bp->b_blkno = blkno; } if (pg_count > max_vectors) { io_size -= (pg_count - max_vectors) * PAGE_SIZE; if (io_size < 0) { io_size = PAGE_SIZE - pg_offset; pg_count = 1; } else pg_count = max_vectors; } if ( !(vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV)) /* * if we're not targeting a virtual device i.e. a disk image * it's safe to dip into the reserve pool since real devices * can complete this I/O request without requiring additional * bufs from the alloc_io_buf pool */ priv = 1; else if ((flags & CL_ASYNC) && !(flags & CL_PAGEOUT)) /* * Throttle the speculative IO */ priv = 0; else priv = 1; cbp = alloc_io_buf(vp, priv); if (flags & CL_PAGEOUT) { for (i = 0; i < pg_count; i++) { int s; struct buf *bp; s = splbio(); if (bp = incore(vp, lblkno + i)) { if (!ISSET(bp->b_flags, B_BUSY)) { bremfree(bp); SET(bp->b_flags, (B_BUSY | B_INVAL)); splx(s); brelse(bp); } else panic("BUSY bp found in cluster_io"); } splx(s); } } if (flags & CL_ASYNC) { cbp->b_flags |= (B_CALL | B_ASYNC); cbp->b_iodone = (void *)cluster_iodone; } cbp->b_flags |= io_flags; cbp->b_lblkno = lblkno; cbp->b_blkno = blkno; cbp->b_bcount = io_size; cbp->b_pagelist = upl; cbp->b_uploffset = upl_offset; cbp->b_trans_next = (struct buf *)0; if (cbp->b_iostate = (void *)iostate) /* * caller wants to track the state of this * io... bump the amount issued against this stream */ iostate->io_issued += io_size; if (flags & CL_READ) KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 26)) | DBG_FUNC_NONE, cbp->b_lblkno, cbp->b_blkno, upl_offset, io_size, 0); else KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 27)) | DBG_FUNC_NONE, cbp->b_lblkno, cbp->b_blkno, upl_offset, io_size, 0); if (cbp_head) { cbp_tail->b_trans_next = cbp; cbp_tail = cbp; } else { cbp_head = cbp; cbp_tail = cbp; } (struct buf *)(cbp->b_trans_head) = cbp_head; buf_count++; upl_offset += io_size; f_offset += io_size; size -= io_size; if ( (!(upl_offset & PAGE_MASK) && !(flags & CL_DEV_MEMORY) && ((flags & CL_ASYNC) || buf_count > 8)) || size == 0) { /* * if we have no more I/O to issue or * the current I/O we've prepared fully * completes the last page in this request * and it's either an ASYNC request or * we've already accumulated more than 8 I/O's into * this transaction and it's not an I/O directed to * special DEVICE memory * then go ahead and issue the I/O */ start_io: if (real_bp) { cbp_head->b_flags |= B_NEED_IODONE; cbp_head->b_real_bp = real_bp; } else cbp_head->b_real_bp = (struct buf *)NULL; if (size == 0) { /* * we're about to issue the last I/O for this upl * if this was a read to the eof and the eof doesn't * finish on a page boundary, than we need to zero-fill * the rest of the page.... */ cbp_head->b_validend = zero_offset; } else cbp_head->b_validend = 0; if (flags & CL_THROTTLE) { while (vp->v_numoutput >= async_throttle) { vp->v_flag |= VTHROTTLED; tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "cluster_io", 0); } } for (cbp = cbp_head; cbp;) { struct buf * cbp_next; if (io_flags & B_WRITEINPROG) cbp->b_vp->v_numoutput++; cbp_next = cbp->b_trans_next; (void) VOP_STRATEGY(cbp); cbp = cbp_next; } if ( !(flags & CL_ASYNC)) { for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) biowait(cbp); if (error = cluster_iodone(cbp_head)) { if ((flags & CL_PAGEOUT) && (error == ENXIO)) retval = 0; /* drop the error */ else retval = error; error = 0; } } cbp_head = (struct buf *)0; cbp_tail = (struct buf *)0; buf_count = 0; } } if (error) { int abort_size; io_size = 0; for (cbp = cbp_head; cbp;) { struct buf * cbp_next; upl_offset -= cbp->b_bcount; size += cbp->b_bcount; io_size += cbp->b_bcount; cbp_next = cbp->b_trans_next; free_io_buf(cbp); cbp = cbp_next; } if (iostate) { /* * update the error condition for this stream * since we never really issued the io * just go ahead and adjust it back */ if (iostate->io_error == 0) iostate->io_error = error; iostate->io_issued -= io_size; if (iostate->io_wanted) { /* * someone is waiting for the state of * this io stream to change */ iostate->io_wanted = 0; wakeup((caddr_t)&iostate->io_wanted); } } pg_offset = upl_offset & PAGE_MASK; abort_size = (size + pg_offset + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (flags & CL_COMMIT) { int upl_abort_code; if (flags & CL_PRESERVE) { ubc_upl_commit_range(upl, upl_offset - pg_offset, abort_size, UPL_COMMIT_FREE_ON_EMPTY); } else { if ((flags & CL_PAGEOUT) && (error != ENXIO)) /* transient error */ upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; else if (flags & CL_PAGEIN) upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR; else upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_DUMP_PAGES; ubc_upl_abort_range(upl, upl_offset - pg_offset, abort_size, upl_abort_code); } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 28)) | DBG_FUNC_NONE, (int)upl, upl_offset - pg_offset, abort_size, error, 0); } if (real_bp) { real_bp->b_flags |= B_ERROR; real_bp->b_error = error; biodone(real_bp); } if (retval == 0) retval = error; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_END, (int)f_offset, size, upl_offset, retval, 0); return (retval); } static int cluster_rd_prefetch(vp, f_offset, size, filesize, devblocksize) struct vnode *vp; off_t f_offset; u_int size; off_t filesize; int devblocksize; { int pages_in_prefetch; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_START, (int)f_offset, size, (int)filesize, 0, 0); if (f_offset >= filesize) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END, (int)f_offset, 0, 0, 0, 0); return(0); } if (size > (MAX_UPL_TRANSFER * PAGE_SIZE)) size = (MAX_UPL_TRANSFER * PAGE_SIZE); else size = (size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if ((off_t)size > (filesize - f_offset)) size = filesize - f_offset; pages_in_prefetch = (size + (PAGE_SIZE - 1)) / PAGE_SIZE; advisory_read(vp, filesize, f_offset, size, devblocksize); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END, (int)f_offset + size, pages_in_prefetch, 0, 1, 0); return (pages_in_prefetch); } static void cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize) struct vnode *vp; daddr_t b_lblkno; daddr_t e_lblkno; off_t filesize; int devblocksize; { daddr_t r_lblkno; off_t f_offset; int size_of_prefetch; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_START, b_lblkno, e_lblkno, vp->v_lastr, 0, 0); if (b_lblkno == vp->v_lastr && b_lblkno == e_lblkno) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, vp->v_ralen, vp->v_maxra, vp->v_lastr, 0, 0); return; } if (vp->v_lastr == -1 || (b_lblkno != vp->v_lastr && b_lblkno != (vp->v_lastr + 1) && (b_lblkno != (vp->v_maxra + 1) || vp->v_ralen == 0))) { vp->v_ralen = 0; vp->v_maxra = 0; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, vp->v_ralen, vp->v_maxra, vp->v_lastr, 1, 0); return; } if (e_lblkno < vp->v_maxra) { if ((vp->v_maxra - e_lblkno) > (MAX_UPL_TRANSFER / 4)) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, vp->v_ralen, vp->v_maxra, vp->v_lastr, 2, 0); return; } } r_lblkno = max(e_lblkno, vp->v_maxra) + 1; f_offset = (off_t)r_lblkno * PAGE_SIZE_64; size_of_prefetch = 0; ubc_range_op(vp, f_offset, f_offset + PAGE_SIZE_64, UPL_ROP_PRESENT, &size_of_prefetch); if (size_of_prefetch) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, vp->v_ralen, vp->v_maxra, vp->v_lastr, 3, 0); return; } if (f_offset < filesize) { vp->v_ralen = vp->v_ralen ? min(MAX_UPL_TRANSFER, vp->v_ralen << 1) : 1; if (((e_lblkno + 1) - b_lblkno) > vp->v_ralen) vp->v_ralen = min(MAX_UPL_TRANSFER, (e_lblkno + 1) - b_lblkno); size_of_prefetch = cluster_rd_prefetch(vp, f_offset, vp->v_ralen * PAGE_SIZE, filesize, devblocksize); if (size_of_prefetch) vp->v_maxra = (r_lblkno + size_of_prefetch) - 1; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, vp->v_ralen, vp->v_maxra, vp->v_lastr, 4, 0); } int cluster_pageout(vp, upl, upl_offset, f_offset, size, filesize, devblocksize, flags) struct vnode *vp; upl_t upl; vm_offset_t upl_offset; off_t f_offset; int size; off_t filesize; int devblocksize; int flags; { int io_size; int rounded_size; off_t max_size; int local_flags; if (vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV) /* * if we know we're issuing this I/O to a virtual device (i.e. disk image) * then we don't want to enforce this throttle... if we do, we can * potentially deadlock since we're stalling the pageout thread at a time * when the disk image might need additional memory (which won't be available * if the pageout thread can't run)... instead we'll just depend on the throttle * that the pageout thread now has in place to deal with external files */ local_flags = CL_PAGEOUT; else local_flags = CL_PAGEOUT | CL_THROTTLE; if ((flags & UPL_IOSYNC) == 0) local_flags |= CL_ASYNC; if ((flags & UPL_NOCOMMIT) == 0) local_flags |= CL_COMMIT; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 52)) | DBG_FUNC_NONE, (int)f_offset, size, (int)filesize, local_flags, 0); /* * If they didn't specify any I/O, then we are done... * we can't issue an abort because we don't know how * big the upl really is */ if (size <= 0) return (EINVAL); if (vp->v_mount->mnt_flag & MNT_RDONLY) { if (local_flags & CL_COMMIT) ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY); return (EROFS); } /* * can't page-in from a negative offset * or if we're starting beyond the EOF * or if the file offset isn't page aligned * or the size requested isn't a multiple of PAGE_SIZE */ if (f_offset < 0 || f_offset >= filesize || (f_offset & PAGE_MASK_64) || (size & PAGE_MASK)) { if (local_flags & CL_COMMIT) ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY); return (EINVAL); } max_size = filesize - f_offset; if (size < max_size) io_size = size; else io_size = max_size; rounded_size = (io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (size > rounded_size) { if (local_flags & CL_COMMIT) ubc_upl_abort_range(upl, upl_offset + rounded_size, size - rounded_size, UPL_ABORT_FREE_ON_EMPTY); } vp->v_flag |= VHASBEENPAGED; return (cluster_io(vp, upl, upl_offset, f_offset, io_size, devblocksize, local_flags, (struct buf *)0, (struct clios *)0)); } int cluster_pagein(vp, upl, upl_offset, f_offset, size, filesize, devblocksize, flags) struct vnode *vp; upl_t upl; vm_offset_t upl_offset; off_t f_offset; int size; off_t filesize; int devblocksize; int flags; { u_int io_size; int rounded_size; off_t max_size; int retval; int local_flags = 0; if (upl == NULL || size < 0) panic("cluster_pagein: NULL upl passed in"); if ((flags & UPL_IOSYNC) == 0) local_flags |= CL_ASYNC; if ((flags & UPL_NOCOMMIT) == 0) local_flags |= CL_COMMIT; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 56)) | DBG_FUNC_NONE, (int)f_offset, size, (int)filesize, local_flags, 0); /* * can't page-in from a negative offset * or if we're starting beyond the EOF * or if the file offset isn't page aligned * or the size requested isn't a multiple of PAGE_SIZE */ if (f_offset < 0 || f_offset >= filesize || (f_offset & PAGE_MASK_64) || (size & PAGE_MASK) || (upl_offset & PAGE_MASK)) { if (local_flags & CL_COMMIT) ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR); return (EINVAL); } max_size = filesize - f_offset; if (size < max_size) io_size = size; else io_size = max_size; rounded_size = (io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (size > rounded_size && (local_flags & CL_COMMIT)) ubc_upl_abort_range(upl, upl_offset + rounded_size, size - rounded_size, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR); retval = cluster_io(vp, upl, upl_offset, f_offset, io_size, devblocksize, local_flags | CL_READ | CL_PAGEIN, (struct buf *)0, (struct clios *)0); if (retval == 0) { int b_lblkno; int e_lblkno; b_lblkno = (int)(f_offset / PAGE_SIZE_64); e_lblkno = (int) ((f_offset + ((off_t)io_size - 1)) / PAGE_SIZE_64); if (!(flags & UPL_NORDAHEAD) && !(vp->v_flag & VRAOFF) && rounded_size == PAGE_SIZE) { /* * we haven't read the last page in of the file yet * so let's try to read ahead if we're in * a sequential access pattern */ cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize); } vp->v_lastr = e_lblkno; } return (retval); } int cluster_bp(bp) struct buf *bp; { off_t f_offset; int flags; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 19)) | DBG_FUNC_START, (int)bp, bp->b_lblkno, bp->b_bcount, bp->b_flags, 0); if (bp->b_pagelist == (upl_t) 0) panic("cluster_bp: can't handle NULL upl yet\n"); if (bp->b_flags & B_READ) flags = CL_ASYNC | CL_READ; else flags = CL_ASYNC; f_offset = ubc_blktooff(bp->b_vp, bp->b_lblkno); return (cluster_io(bp->b_vp, bp->b_pagelist, 0, f_offset, bp->b_bcount, 0, flags, bp, (struct clios *)0)); } int cluster_write(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t oldEOF; off_t newEOF; off_t headOff; off_t tailOff; int devblocksize; int flags; { int prev_resid; int clip_size; off_t max_io_size; struct iovec *iov; int upl_size; int upl_flags; upl_t upl; int retval = 0; if (vp->v_flag & VHASBEENPAGED) { /* * this vnode had pages cleaned to it by * the pager which indicates that either * it's not very 'hot', or the system is * being overwhelmed by a lot of dirty * data being delayed in the VM cache... * in either event, we'll push our remaining * delayed data at this point... this will * be more efficient than paging out 1 page at * a time, and will also act as a throttle * by delaying this client from writing any * more data until all his delayed data has * at least been queued to the uderlying driver. */ cluster_push(vp); vp->v_flag &= ~VHASBEENPAGED; } if ( (!(vp->v_flag & VNOCACHE_DATA)) || (!uio) || (uio->uio_segflg != UIO_USERSPACE)) { /* * go do a write through the cache if one of the following is true.... * NOCACHE is not true * there is no uio structure or it doesn't target USERSPACE */ return (cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags)); } while (uio->uio_resid && uio->uio_offset < newEOF && retval == 0) { /* * we know we have a resid, so this is safe * skip over any emtpy vectors */ iov = uio->uio_iov; while (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; iov = uio->uio_iov; } upl_size = PAGE_SIZE; upl_flags = UPL_QUERY_OBJECT_TYPE; if ((vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, NULL, &upl_flags, 0)) != KERN_SUCCESS) { /* * the user app must have passed in an invalid address */ return (EFAULT); } /* * We check every vector target but if it is physically * contiguous space, we skip the sanity checks. */ if (upl_flags & UPL_PHYS_CONTIG) { if (flags & IO_HEADZEROFILL) { flags &= ~IO_HEADZEROFILL; if (retval = cluster_write_x(vp, (struct uio *)0, 0, uio->uio_offset, headOff, 0, devblocksize, IO_HEADZEROFILL)) return(retval); } retval = cluster_phys_write(vp, uio, newEOF, devblocksize, flags); if (uio->uio_resid == 0 && (flags & IO_TAILZEROFILL)) { return (cluster_write_x(vp, (struct uio *)0, 0, tailOff, uio->uio_offset, 0, devblocksize, IO_HEADZEROFILL)); } } else if ((uio->uio_resid < PAGE_SIZE) || (flags & (IO_TAILZEROFILL | IO_HEADZEROFILL))) { /* * we're here because we're don't have a physically contiguous target buffer * go do a write through the cache if one of the following is true.... * the total xfer size is less than a page... * we're being asked to ZEROFILL either the head or the tail of the I/O... */ return (cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags)); } else if (((int)uio->uio_offset & PAGE_MASK) || ((int)iov->iov_base & PAGE_MASK)) { if (((int)uio->uio_offset & PAGE_MASK) == ((int)iov->iov_base & PAGE_MASK)) { /* * Bring the file offset write up to a pagesize boundary * this will also bring the base address to a page boundary * since they both are currently on the same offset within a page * note: if we get here, uio->uio_resid is greater than PAGE_SIZE * so the computed clip_size must always be less than the current uio_resid */ clip_size = (PAGE_SIZE - (uio->uio_offset & PAGE_MASK_64)); /* * Fake the resid going into the cluster_write_x call * and restore it on the way out. */ prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else { /* * can't get both the file offset and the buffer offset aligned to a page boundary * so fire an I/O through the cache for this entire vector */ clip_size = iov->iov_len; prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } } else { /* * If we come in here, we know the offset into * the file is on a pagesize boundary and the * target buffer address is also on a page boundary */ max_io_size = newEOF - uio->uio_offset; clip_size = uio->uio_resid; if (iov->iov_len < clip_size) clip_size = iov->iov_len; if (max_io_size < clip_size) clip_size = max_io_size; if (clip_size < PAGE_SIZE) { /* * Take care of tail end of write in this vector */ prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else { /* round clip_size down to a multiple of pagesize */ clip_size = clip_size & ~(PAGE_MASK); prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_nocopy_write(vp, uio, newEOF, devblocksize, flags); if ((retval == 0) && uio->uio_resid) retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } } /* end else */ } /* end while */ return(retval); } static int cluster_nocopy_write(vp, uio, newEOF, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t newEOF; int devblocksize; int flags; { upl_t upl; upl_page_info_t *pl; off_t upl_f_offset; vm_offset_t upl_offset; off_t max_io_size; int io_size; int io_flag; int upl_size; int upl_needed_size; int pages_in_pl; int upl_flags; kern_return_t kret; struct iovec *iov; int i; int force_data_sync; int error = 0; struct clios iostate; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_START, (int)uio->uio_offset, (int)uio->uio_resid, (int)newEOF, devblocksize, 0); /* * When we enter this routine, we know * -- the offset into the file is on a pagesize boundary * -- the resid is a page multiple * -- the resid will not exceed iov_len */ cluster_try_push(vp, newEOF, 0, 1); iostate.io_completed = 0; iostate.io_issued = 0; iostate.io_error = 0; iostate.io_wanted = 0; iov = uio->uio_iov; while (uio->uio_resid && uio->uio_offset < newEOF && error == 0) { io_size = uio->uio_resid; if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) io_size = MAX_UPL_TRANSFER * PAGE_SIZE; upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK; upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_START, (int)upl_offset, upl_needed_size, (int)iov->iov_base, io_size, 0); for (force_data_sync = 0; force_data_sync < 3; force_data_sync++) { pages_in_pl = 0; upl_size = upl_needed_size; upl_flags = UPL_FILE_IO | UPL_COPYOUT_FROM | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE; kret = vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, force_data_sync); if (kret != KERN_SUCCESS) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END, 0, 0, 0, kret, 0); /* * cluster_nocopy_write: failed to get pagelist * * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_writes; } pl = UPL_GET_INTERNAL_PAGE_LIST(upl); pages_in_pl = upl_size / PAGE_SIZE; for (i = 0; i < pages_in_pl; i++) { if (!upl_valid_page(pl, i)) break; } if (i == pages_in_pl) break; /* * didn't get all the pages back that we * needed... release this upl and try again */ ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); } if (force_data_sync >= 3) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END, i, pages_in_pl, upl_size, kret, 0); /* * for some reason, we couldn't acquire a hold on all * the pages needed in the user's address space * * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_writes; } /* * Consider the possibility that upl_size wasn't satisfied. */ if (upl_size != upl_needed_size) io_size = (upl_size - (int)upl_offset) & ~PAGE_MASK; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END, (int)upl_offset, upl_size, (int)iov->iov_base, io_size, 0); if (io_size == 0) { ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); /* * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_writes; } /* * Now look for pages already in the cache * and throw them away. * uio->uio_offset is page aligned within the file * io_size is a multiple of PAGE_SIZE */ ubc_range_op(vp, uio->uio_offset, uio->uio_offset + io_size, UPL_ROP_DUMP, NULL); /* * we want push out these writes asynchronously so that we can overlap * the preparation of the next I/O * if there are already too many outstanding writes * wait until some complete before issuing the next */ while ((iostate.io_issued - iostate.io_completed) > (2 * MAX_UPL_TRANSFER * PAGE_SIZE)) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_nocopy_write", 0); } if (iostate.io_error) { /* * one of the earlier writes we issued ran into a hard error * don't issue any more writes, cleanup the UPL * that was just created but not used, then * go wait for all writes that are part of this stream * to complete before returning the error to the caller */ ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); goto wait_for_writes; } io_flag = CL_ASYNC | CL_PRESERVE | CL_COMMIT | CL_THROTTLE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_START, (int)upl_offset, (int)uio->uio_offset, io_size, io_flag, 0); error = cluster_io(vp, upl, upl_offset, uio->uio_offset, io_size, devblocksize, io_flag, (struct buf *)0, &iostate); iov->iov_len -= io_size; iov->iov_base += io_size; uio->uio_resid -= io_size; uio->uio_offset += io_size; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_END, (int)upl_offset, (int)uio->uio_offset, (int)uio->uio_resid, error, 0); } /* end while */ wait_for_writes: /* * make sure all async writes issued as part of this stream * have completed before we return */ while (iostate.io_issued != iostate.io_completed) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_nocopy_write", 0); } if (iostate.io_error) error = iostate.io_error; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_END, (int)uio->uio_offset, (int)uio->uio_resid, error, 4, 0); return (error); } static int cluster_phys_write(vp, uio, newEOF, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t newEOF; int devblocksize; int flags; { upl_page_info_t *pl; addr64_t src_paddr; upl_t upl; vm_offset_t upl_offset; int tail_size; int io_size; int upl_size; int upl_needed_size; int pages_in_pl; int upl_flags; kern_return_t kret; struct iovec *iov; int error = 0; /* * When we enter this routine, we know * -- the resid will not exceed iov_len * -- the vector target address is physcially contiguous */ cluster_try_push(vp, newEOF, 0, 1); iov = uio->uio_iov; io_size = iov->iov_len; upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK; upl_needed_size = upl_offset + io_size; pages_in_pl = 0; upl_size = upl_needed_size; upl_flags = UPL_FILE_IO | UPL_COPYOUT_FROM | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE; kret = vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0); if (kret != KERN_SUCCESS) { /* * cluster_phys_write: failed to get pagelist * note: return kret here */ return(EINVAL); } /* * Consider the possibility that upl_size wasn't satisfied. * This is a failure in the physical memory case. */ if (upl_size < upl_needed_size) { kernel_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return(EINVAL); } pl = ubc_upl_pageinfo(upl); src_paddr = ((addr64_t)upl_phys_page(pl, 0) << 12) + ((addr64_t)((u_int)iov->iov_base & PAGE_MASK)); while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) { int head_size; head_size = devblocksize - (int)(uio->uio_offset & (devblocksize - 1)); if (head_size > io_size) head_size = io_size; error = cluster_align_phys_io(vp, uio, src_paddr, head_size, devblocksize, 0); if (error) { ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return(EINVAL); } upl_offset += head_size; src_paddr += head_size; io_size -= head_size; } tail_size = io_size & (devblocksize - 1); io_size -= tail_size; if (io_size) { /* * issue a synchronous write to cluster_io */ error = cluster_io(vp, upl, upl_offset, uio->uio_offset, io_size, 0, CL_DEV_MEMORY, (struct buf *)0, (struct clios *)0); } if (error == 0) { /* * The cluster_io write completed successfully, * update the uio structure */ uio->uio_resid -= io_size; iov->iov_len -= io_size; iov->iov_base += io_size; uio->uio_offset += io_size; src_paddr += io_size; if (tail_size) error = cluster_align_phys_io(vp, uio, src_paddr, tail_size, devblocksize, 0); } /* * just release our hold on the physically contiguous * region without changing any state */ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return (error); } static int cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t oldEOF; off_t newEOF; off_t headOff; off_t tailOff; int devblocksize; int flags; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; int upl_size; off_t upl_f_offset; int pages_in_upl; int start_offset; int xfer_resid; int io_size; int io_flags; int io_offset; int bytes_to_zero; int bytes_to_move; kern_return_t kret; int retval = 0; int uio_resid; long long total_size; long long zero_cnt; off_t zero_off; long long zero_cnt1; off_t zero_off1; daddr_t start_blkno; daddr_t last_blkno; int intersection; if (uio) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START, (int)uio->uio_offset, uio->uio_resid, (int)oldEOF, (int)newEOF, 0); uio_resid = uio->uio_resid; } else { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START, 0, 0, (int)oldEOF, (int)newEOF, 0); uio_resid = 0; } zero_cnt = 0; zero_cnt1 = 0; if (flags & IO_HEADZEROFILL) { /* * some filesystems (HFS is one) don't support unallocated holes within a file... * so we zero fill the intervening space between the old EOF and the offset * where the next chunk of real data begins.... ftruncate will also use this * routine to zero fill to the new EOF when growing a file... in this case, the * uio structure will not be provided */ if (uio) { if (headOff < uio->uio_offset) { zero_cnt = uio->uio_offset - headOff; zero_off = headOff; } } else if (headOff < newEOF) { zero_cnt = newEOF - headOff; zero_off = headOff; } } if (flags & IO_TAILZEROFILL) { if (uio) { zero_off1 = uio->uio_offset + uio->uio_resid; if (zero_off1 < tailOff) zero_cnt1 = tailOff - zero_off1; } } if (zero_cnt == 0 && uio == (struct uio *) 0) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END, retval, 0, 0, 0, 0); return (0); } while ((total_size = (uio_resid + zero_cnt + zero_cnt1)) && retval == 0) { /* * for this iteration of the loop, figure out where our starting point is */ if (zero_cnt) { start_offset = (int)(zero_off & PAGE_MASK_64); upl_f_offset = zero_off - start_offset; } else if (uio_resid) { start_offset = (int)(uio->uio_offset & PAGE_MASK_64); upl_f_offset = uio->uio_offset - start_offset; } else { start_offset = (int)(zero_off1 & PAGE_MASK_64); upl_f_offset = zero_off1 - start_offset; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 46)) | DBG_FUNC_NONE, (int)zero_off, (int)zero_cnt, (int)zero_off1, (int)zero_cnt1, 0); if (total_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) total_size = MAX_UPL_TRANSFER * PAGE_SIZE; start_blkno = (daddr_t)(upl_f_offset / PAGE_SIZE_64); if (uio && !(vp->v_flag & VNOCACHE_DATA) && (flags & (IO_SYNC | IO_HEADZEROFILL | IO_TAILZEROFILL)) == 0) { /* * assumption... total_size <= uio_resid * because IO_HEADZEROFILL and IO_TAILZEROFILL not set */ if ((start_offset + total_size) > (MAX_UPL_TRANSFER * PAGE_SIZE)) total_size -= start_offset; xfer_resid = total_size; retval = cluster_copy_ubc_data(vp, uio, &xfer_resid, 1); if (retval) break; uio_resid -= (total_size - xfer_resid); total_size = xfer_resid; start_offset = (int)(uio->uio_offset & PAGE_MASK_64); upl_f_offset = uio->uio_offset - start_offset; if (total_size == 0) { if (start_offset) { /* * the write did not finish on a page boundary * which will leave upl_f_offset pointing to the * beginning of the last page written instead of * the page beyond it... bump it in this case * so that the cluster code records the last page * written as dirty */ upl_f_offset += PAGE_SIZE_64; } upl_size = 0; goto check_cluster; } } /* * compute the size of the upl needed to encompass * the requested write... limit each call to cluster_io * to the maximum UPL size... cluster_io will clip if * this exceeds the maximum io_size for the device, * make sure to account for * a starting offset that's not page aligned */ upl_size = (start_offset + total_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) upl_size = MAX_UPL_TRANSFER * PAGE_SIZE; pages_in_upl = upl_size / PAGE_SIZE; io_size = upl_size - start_offset; if ((long long)io_size > total_size) io_size = total_size; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_START, upl_size, io_size, total_size, 0, 0); kret = ubc_create_upl(vp, upl_f_offset, upl_size, &upl, &pl, UPL_SET_LITE); if (kret != KERN_SUCCESS) panic("cluster_write: failed to get pagelist"); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_END, (int)upl, (int)upl_f_offset, start_offset, 0, 0); if (start_offset && !upl_valid_page(pl, 0)) { int read_size; /* * we're starting in the middle of the first page of the upl * and the page isn't currently valid, so we're going to have * to read it in first... this is a synchronous operation */ read_size = PAGE_SIZE; if ((upl_f_offset + read_size) > newEOF) read_size = newEOF - upl_f_offset; retval = cluster_io(vp, upl, 0, upl_f_offset, read_size, devblocksize, CL_READ, (struct buf *)0, (struct clios *)0); if (retval) { /* * we had an error during the read which causes us to abort * the current cluster_write request... before we do, we need * to release the rest of the pages in the upl without modifying * there state and mark the failed page in error */ ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES); ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE, (int)upl, 0, 0, retval, 0); break; } } if ((start_offset == 0 || upl_size > PAGE_SIZE) && ((start_offset + io_size) & PAGE_MASK)) { /* * the last offset we're writing to in this upl does not end on a page * boundary... if it's not beyond the old EOF, then we'll also need to * pre-read this page in if it isn't already valid */ upl_offset = upl_size - PAGE_SIZE; if ((upl_f_offset + start_offset + io_size) < oldEOF && !upl_valid_page(pl, upl_offset / PAGE_SIZE)) { int read_size; read_size = PAGE_SIZE; if ((upl_f_offset + upl_offset + read_size) > newEOF) read_size = newEOF - (upl_f_offset + upl_offset); retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, read_size, devblocksize, CL_READ, (struct buf *)0, (struct clios *)0); if (retval) { /* * we had an error during the read which causes us to abort * the current cluster_write request... before we do, we * need to release the rest of the pages in the upl without * modifying there state and mark the failed page in error */ ubc_upl_abort_range(upl, upl_offset, PAGE_SIZE, UPL_ABORT_DUMP_PAGES); ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE, (int)upl, 0, 0, retval, 0); break; } } } xfer_resid = io_size; io_offset = start_offset; while (zero_cnt && xfer_resid) { if (zero_cnt < (long long)xfer_resid) bytes_to_zero = zero_cnt; else bytes_to_zero = xfer_resid; if ( !(flags & (IO_NOZEROVALID | IO_NOZERODIRTY))) { cluster_zero(upl, io_offset, bytes_to_zero, NULL); } else { int zero_pg_index; bytes_to_zero = min(bytes_to_zero, PAGE_SIZE - (int)(zero_off & PAGE_MASK_64)); zero_pg_index = (int)((zero_off - upl_f_offset) / PAGE_SIZE_64); if ( !upl_valid_page(pl, zero_pg_index)) { cluster_zero(upl, io_offset, bytes_to_zero, NULL); } else if ((flags & (IO_NOZERODIRTY | IO_NOZEROVALID)) == IO_NOZERODIRTY && !upl_dirty_page(pl, zero_pg_index)) { cluster_zero(upl, io_offset, bytes_to_zero, NULL); } } xfer_resid -= bytes_to_zero; zero_cnt -= bytes_to_zero; zero_off += bytes_to_zero; io_offset += bytes_to_zero; } if (xfer_resid && uio_resid) { bytes_to_move = min(uio_resid, xfer_resid); retval = cluster_copy_upl_data(uio, upl, io_offset, bytes_to_move); if (retval) { ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE, (int)upl, 0, 0, retval, 0); } else { uio_resid -= bytes_to_move; xfer_resid -= bytes_to_move; io_offset += bytes_to_move; } } while (xfer_resid && zero_cnt1 && retval == 0) { if (zero_cnt1 < (long long)xfer_resid) bytes_to_zero = zero_cnt1; else bytes_to_zero = xfer_resid; if ( !(flags & (IO_NOZEROVALID | IO_NOZERODIRTY))) { cluster_zero(upl, io_offset, bytes_to_zero, NULL); } else { int zero_pg_index; bytes_to_zero = min(bytes_to_zero, PAGE_SIZE - (int)(zero_off1 & PAGE_MASK_64)); zero_pg_index = (int)((zero_off1 - upl_f_offset) / PAGE_SIZE_64); if ( !upl_valid_page(pl, zero_pg_index)) { cluster_zero(upl, io_offset, bytes_to_zero, NULL); } else if ((flags & (IO_NOZERODIRTY | IO_NOZEROVALID)) == IO_NOZERODIRTY && !upl_dirty_page(pl, zero_pg_index)) { cluster_zero(upl, io_offset, bytes_to_zero, NULL); } } xfer_resid -= bytes_to_zero; zero_cnt1 -= bytes_to_zero; zero_off1 += bytes_to_zero; io_offset += bytes_to_zero; } if (retval == 0) { int cl_index; int can_delay; io_size += start_offset; if ((upl_f_offset + io_size) >= newEOF && io_size < upl_size) { /* * if we're extending the file with this write * we'll zero fill the rest of the page so that * if the file gets extended again in such a way as to leave a * hole starting at this EOF, we'll have zero's in the correct spot */ cluster_zero(upl, io_size, upl_size - io_size, NULL); } if (flags & IO_SYNC) /* * if the IO_SYNC flag is set than we need to * bypass any clusters and immediately issue * the I/O */ goto issue_io; check_cluster: /* * calculate the last logical block number * that this delayed I/O encompassed */ last_blkno = (upl_f_offset + (off_t)upl_size) / PAGE_SIZE_64; if (vp->v_flag & VHASDIRTY) { if ( !(vp->v_flag & VNOCACHE_DATA)) { /* * we've fallen into the sparse * cluster method of delaying dirty pages * first, we need to release the upl if we hold one * since pages in it may be present in the sparse cluster map * and may span 2 separate buckets there... if they do and * we happen to have to flush a bucket to make room and it intersects * this upl, a deadlock may result on page BUSY */ if (upl_size) ubc_upl_commit_range(upl, 0, upl_size, UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); sparse_cluster_add(vp, newEOF, start_blkno, last_blkno); continue; } /* * must have done cached writes that fell into * the sparse cluster mechanism... we've switched * to uncached writes on the file, so go ahead * and push whatever's in the sparse map * and switch back to normal clustering * * see the comment above concerning a possible deadlock... */ if (upl_size) { ubc_upl_commit_range(upl, 0, upl_size, UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); /* * setting upl_size to 0 keeps us from committing a * second time in the start_new_cluster path */ upl_size = 0; } sparse_cluster_push(vp, ubc_getsize(vp), 1); /* * no clusters of either type present at this point * so just go directly to start_new_cluster since * we know we need to delay this I/O since we've * already released the pages back into the cache * to avoid the deadlock with sparse_cluster_push */ goto start_new_cluster; } upl_offset = 0; if (vp->v_clen == 0) /* * no clusters currently present */ goto start_new_cluster; for (cl_index = 0; cl_index < vp->v_clen; cl_index++) { /* * check each cluster that we currently hold * try to merge some or all of this write into * one or more of the existing clusters... if * any portion of the write remains, start a * new cluster */ if (start_blkno >= vp->v_clusters[cl_index].start_pg) { /* * the current write starts at or after the current cluster */ if (last_blkno <= (vp->v_clusters[cl_index].start_pg + MAX_UPL_TRANSFER)) { /* * we have a write that fits entirely * within the existing cluster limits */ if (last_blkno > vp->v_clusters[cl_index].last_pg) /* * update our idea of where the cluster ends */ vp->v_clusters[cl_index].last_pg = last_blkno; break; } if (start_blkno < (vp->v_clusters[cl_index].start_pg + MAX_UPL_TRANSFER)) { /* * we have a write that starts in the middle of the current cluster * but extends beyond the cluster's limit... we know this because * of the previous checks * we'll extend the current cluster to the max * and update the start_blkno for the current write to reflect that * the head of it was absorbed into this cluster... * note that we'll always have a leftover tail in this case since * full absorbtion would have occurred in the clause above */ vp->v_clusters[cl_index].last_pg = vp->v_clusters[cl_index].start_pg + MAX_UPL_TRANSFER; if (upl_size) { int start_pg_in_upl; start_pg_in_upl = upl_f_offset / PAGE_SIZE_64; if (start_pg_in_upl < vp->v_clusters[cl_index].last_pg) { intersection = (vp->v_clusters[cl_index].last_pg - start_pg_in_upl) * PAGE_SIZE; ubc_upl_commit_range(upl, upl_offset, intersection, UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); upl_f_offset += intersection; upl_offset += intersection; upl_size -= intersection; } } start_blkno = vp->v_clusters[cl_index].last_pg; } /* * we come here for the case where the current write starts * beyond the limit of the existing cluster or we have a leftover * tail after a partial absorbtion * * in either case, we'll check the remaining clusters before * starting a new one */ } else { /* * the current write starts in front of the cluster we're currently considering */ if ((vp->v_clusters[cl_index].last_pg - start_blkno) <= MAX_UPL_TRANSFER) { /* * we can just merge the new request into * this cluster and leave it in the cache * since the resulting cluster is still * less than the maximum allowable size */ vp->v_clusters[cl_index].start_pg = start_blkno; if (last_blkno > vp->v_clusters[cl_index].last_pg) { /* * the current write completely * envelops the existing cluster and since * each write is limited to at most MAX_UPL_TRANSFER bytes * we can just use the start and last blocknos of the write * to generate the cluster limits */ vp->v_clusters[cl_index].last_pg = last_blkno; } break; } /* * if we were to combine this write with the current cluster * we would exceed the cluster size limit.... so, * let's see if there's any overlap of the new I/O with * the cluster we're currently considering... in fact, we'll * stretch the cluster out to it's full limit and see if we * get an intersection with the current write * */ if (last_blkno > vp->v_clusters[cl_index].last_pg - MAX_UPL_TRANSFER) { /* * the current write extends into the proposed cluster * clip the length of the current write after first combining it's * tail with the newly shaped cluster */ vp->v_clusters[cl_index].start_pg = vp->v_clusters[cl_index].last_pg - MAX_UPL_TRANSFER; if (upl_size) { intersection = (last_blkno - vp->v_clusters[cl_index].start_pg) * PAGE_SIZE; if (intersection > upl_size) /* * because the current write may consist of a number of pages found in the cache * which are not part of the UPL, we may have an intersection that exceeds * the size of the UPL that is also part of this write */ intersection = upl_size; ubc_upl_commit_range(upl, upl_offset + (upl_size - intersection), intersection, UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); upl_size -= intersection; } last_blkno = vp->v_clusters[cl_index].start_pg; } /* * if we get here, there was no way to merge * any portion of this write with this cluster * or we could only merge part of it which * will leave a tail... * we'll check the remaining clusters before starting a new one */ } } if (cl_index < vp->v_clen) /* * we found an existing cluster(s) that we * could entirely merge this I/O into */ goto delay_io; if (vp->v_clen < MAX_CLUSTERS && !(vp->v_flag & VNOCACHE_DATA)) /* * we didn't find an existing cluster to * merge into, but there's room to start * a new one */ goto start_new_cluster; /* * no exisitng cluster to merge with and no * room to start a new one... we'll try * pushing one of the existing ones... if none of * them are able to be pushed, we'll switch * to the sparse cluster mechanism * cluster_try_push updates v_clen to the * number of remaining clusters... and * returns the number of currently unused clusters */ if (vp->v_flag & VNOCACHE_DATA) can_delay = 0; else can_delay = 1; if (cluster_try_push(vp, newEOF, can_delay, 0) == 0) { /* * no more room in the normal cluster mechanism * so let's switch to the more expansive but expensive * sparse mechanism.... * first, we need to release the upl if we hold one * since pages in it may be present in the sparse cluster map (after the cluster_switch) * and may span 2 separate buckets there... if they do and * we happen to have to flush a bucket to make room and it intersects * this upl, a deadlock may result on page BUSY */ if (upl_size) ubc_upl_commit_range(upl, upl_offset, upl_size, UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); sparse_cluster_switch(vp, newEOF); sparse_cluster_add(vp, newEOF, start_blkno, last_blkno); continue; } /* * we pushed one cluster successfully, so we must be sequentially writing this file * otherwise, we would have failed and fallen into the sparse cluster support * so let's take the opportunity to push out additional clusters as long as we * remain below the throttle... this will give us better I/O locality if we're * in a copy loop (i.e. we won't jump back and forth between the read and write points * however, we don't want to push so much out that the write throttle kicks in and * hangs this thread up until some of the I/O completes... */ while (vp->v_clen && (vp->v_numoutput <= (ASYNC_THROTTLE / 2))) cluster_try_push(vp, newEOF, 0, 0); start_new_cluster: if (vp->v_clen == 0) vp->v_ciosiz = devblocksize; vp->v_clusters[vp->v_clen].start_pg = start_blkno; vp->v_clusters[vp->v_clen].last_pg = last_blkno; vp->v_clen++; delay_io: if (upl_size) ubc_upl_commit_range(upl, upl_offset, upl_size, UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); continue; issue_io: /* * in order to maintain some semblance of coherency with mapped writes * we need to write the cluster back out as a multiple of the PAGESIZE * unless the cluster encompasses the last page of the file... in this * case we'll round out to the nearest device block boundary */ io_size = upl_size; if ((upl_f_offset + io_size) > newEOF) { io_size = newEOF - upl_f_offset; io_size = (io_size + (devblocksize - 1)) & ~(devblocksize - 1); } if (flags & IO_SYNC) io_flags = CL_THROTTLE | CL_COMMIT | CL_AGE; else io_flags = CL_THROTTLE | CL_COMMIT | CL_AGE | CL_ASYNC; if (vp->v_flag & VNOCACHE_DATA) io_flags |= CL_DUMP; retval = cluster_io(vp, upl, 0, upl_f_offset, io_size, devblocksize, io_flags, (struct buf *)0, (struct clios *)0); } } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END, retval, 0, uio_resid, 0, 0); return (retval); } int cluster_read(vp, uio, filesize, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t filesize; int devblocksize; int flags; { int prev_resid; int clip_size; off_t max_io_size; struct iovec *iov; int upl_size; int upl_flags; upl_t upl; int retval = 0; if (!((vp->v_flag & VNOCACHE_DATA) && (uio->uio_segflg == UIO_USERSPACE))) { /* * go do a read through the cache if one of the following is true.... * NOCACHE is not true * the uio request doesn't target USERSPACE */ return (cluster_read_x(vp, uio, filesize, devblocksize, flags)); } while (uio->uio_resid && uio->uio_offset < filesize && retval == 0) { /* * we know we have a resid, so this is safe * skip over any emtpy vectors */ iov = uio->uio_iov; while (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; iov = uio->uio_iov; } upl_size = PAGE_SIZE; upl_flags = UPL_QUERY_OBJECT_TYPE; if ((vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, NULL, &upl_flags, 0)) != KERN_SUCCESS) { /* * the user app must have passed in an invalid address */ return (EFAULT); } /* * We check every vector target but if it is physically * contiguous space, we skip the sanity checks. */ if (upl_flags & UPL_PHYS_CONTIG) { retval = cluster_phys_read(vp, uio, filesize, devblocksize, flags); } else if (uio->uio_resid < PAGE_SIZE) { /* * we're here because we're don't have a physically contiguous target buffer * go do a read through the cache if * the total xfer size is less than a page... */ return (cluster_read_x(vp, uio, filesize, devblocksize, flags)); } else if (((int)uio->uio_offset & PAGE_MASK) || ((int)iov->iov_base & PAGE_MASK)) { if (((int)uio->uio_offset & PAGE_MASK) == ((int)iov->iov_base & PAGE_MASK)) { /* * Bring the file offset read up to a pagesize boundary * this will also bring the base address to a page boundary * since they both are currently on the same offset within a page * note: if we get here, uio->uio_resid is greater than PAGE_SIZE * so the computed clip_size must always be less than the current uio_resid */ clip_size = (PAGE_SIZE - (int)(uio->uio_offset & PAGE_MASK_64)); /* * Fake the resid going into the cluster_read_x call * and restore it on the way out. */ prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else { /* * can't get both the file offset and the buffer offset aligned to a page boundary * so fire an I/O through the cache for this entire vector */ clip_size = iov->iov_len; prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } } else { /* * If we come in here, we know the offset into * the file is on a pagesize boundary */ max_io_size = filesize - uio->uio_offset; clip_size = uio->uio_resid; if (iov->iov_len < clip_size) clip_size = iov->iov_len; if (max_io_size < clip_size) clip_size = (int)max_io_size; if (clip_size < PAGE_SIZE) { /* * Take care of the tail end of the read in this vector. */ prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else { /* round clip_size down to a multiple of pagesize */ clip_size = clip_size & ~(PAGE_MASK); prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_nocopy_read(vp, uio, filesize, devblocksize, flags); if ((retval==0) && uio->uio_resid) retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } } /* end else */ } /* end while */ return(retval); } static int cluster_read_x(vp, uio, filesize, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t filesize; int devblocksize; int flags; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; int upl_size; off_t upl_f_offset; int start_offset; int start_pg; int last_pg; int uio_last; int pages_in_upl; off_t max_size; off_t last_ioread_offset; off_t last_request_offset; u_int size_of_prefetch; int io_size; kern_return_t kret; int error = 0; int retval = 0; u_int b_lblkno; u_int e_lblkno; struct clios iostate; u_int max_rd_size = MAX_UPL_TRANSFER * PAGE_SIZE; u_int rd_ahead_enabled = 1; u_int prefetch_enabled = 1; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_START, (int)uio->uio_offset, uio->uio_resid, (int)filesize, devblocksize, 0); if (cluster_hard_throttle_on(vp)) { rd_ahead_enabled = 0; prefetch_enabled = 0; max_rd_size = HARD_THROTTLE_MAXSIZE; } if (vp->v_flag & (VRAOFF|VNOCACHE_DATA)) rd_ahead_enabled = 0; last_request_offset = uio->uio_offset + uio->uio_resid; if (last_request_offset > filesize) last_request_offset = filesize; b_lblkno = (u_int)(uio->uio_offset / PAGE_SIZE_64); e_lblkno = (u_int)((last_request_offset - 1) / PAGE_SIZE_64); if (vp->v_ralen && (vp->v_lastr == b_lblkno || (vp->v_lastr + 1) == b_lblkno)) { /* * determine if we already have a read-ahead in the pipe courtesy of the * last read systemcall that was issued... * if so, pick up it's extent to determine where we should start * with respect to any read-ahead that might be necessary to * garner all the data needed to complete this read systemcall */ last_ioread_offset = (vp->v_maxra * PAGE_SIZE_64) + PAGE_SIZE_64; if (last_ioread_offset < uio->uio_offset) last_ioread_offset = (off_t)0; else if (last_ioread_offset > last_request_offset) last_ioread_offset = last_request_offset; } else last_ioread_offset = (off_t)0; while (uio->uio_resid && uio->uio_offset < filesize && retval == 0) { /* * compute the size of the upl needed to encompass * the requested read... limit each call to cluster_io * to the maximum UPL size... cluster_io will clip if * this exceeds the maximum io_size for the device, * make sure to account for * a starting offset that's not page aligned */ start_offset = (int)(uio->uio_offset & PAGE_MASK_64); upl_f_offset = uio->uio_offset - (off_t)start_offset; max_size = filesize - uio->uio_offset; if ((off_t)((unsigned int)uio->uio_resid) < max_size) io_size = uio->uio_resid; else io_size = max_size; if (!(vp->v_flag & VNOCACHE_DATA)) { while (io_size) { u_int io_resid; u_int io_requested; /* * if we keep finding the pages we need already in the cache, then * don't bother to call cluster_rd_prefetch since it costs CPU cycles * to determine that we have all the pages we need... once we miss in * the cache and have issued an I/O, than we'll assume that we're likely * to continue to miss in the cache and it's to our advantage to try and prefetch */ if (last_request_offset && last_ioread_offset && (size_of_prefetch = (last_request_offset - last_ioread_offset))) { if ((last_ioread_offset - uio->uio_offset) <= max_rd_size && prefetch_enabled) { /* * we've already issued I/O for this request and * there's still work to do and * our prefetch stream is running dry, so issue a * pre-fetch I/O... the I/O latency will overlap * with the copying of the data */ if (size_of_prefetch > max_rd_size) size_of_prefetch = max_rd_size; size_of_prefetch = cluster_rd_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize, devblocksize); last_ioread_offset += (off_t)(size_of_prefetch * PAGE_SIZE); if (last_ioread_offset > last_request_offset) last_ioread_offset = last_request_offset; } } /* * limit the size of the copy we're about to do so that * we can notice that our I/O pipe is running dry and * get the next I/O issued before it does go dry */ if (last_ioread_offset && io_size > ((MAX_UPL_TRANSFER * PAGE_SIZE) / 4)) io_resid = ((MAX_UPL_TRANSFER * PAGE_SIZE) / 4); else io_resid = io_size; io_requested = io_resid; retval = cluster_copy_ubc_data(vp, uio, &io_resid, 0); io_size -= (io_requested - io_resid); if (retval || io_resid) /* * if we run into a real error or * a page that is not in the cache * we need to leave streaming mode */ break; if ((io_size == 0 || last_ioread_offset == last_request_offset) && rd_ahead_enabled) { /* * we're already finished the I/O for this read request * let's see if we should do a read-ahead */ cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize); } } if (retval) break; if (io_size == 0) { if (e_lblkno < vp->v_lastr) vp->v_maxra = 0; vp->v_lastr = e_lblkno; break; } start_offset = (int)(uio->uio_offset & PAGE_MASK_64); upl_f_offset = uio->uio_offset - (off_t)start_offset; max_size = filesize - uio->uio_offset; } if (io_size > max_rd_size) io_size = max_rd_size; upl_size = (start_offset + io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE) / 4) upl_size = (MAX_UPL_TRANSFER * PAGE_SIZE) / 4; pages_in_upl = upl_size / PAGE_SIZE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_START, (int)upl, (int)upl_f_offset, upl_size, start_offset, 0); kret = ubc_create_upl(vp, upl_f_offset, upl_size, &upl, &pl, UPL_SET_LITE); if (kret != KERN_SUCCESS) panic("cluster_read: failed to get pagelist"); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_END, (int)upl, (int)upl_f_offset, upl_size, start_offset, 0); /* * scan from the beginning of the upl looking for the first * non-valid page.... this will become the first page in * the request we're going to make to 'cluster_io'... if all * of the pages are valid, we won't call through to 'cluster_io' */ for (start_pg = 0; start_pg < pages_in_upl; start_pg++) { if (!upl_valid_page(pl, start_pg)) break; } /* * scan from the starting invalid page looking for a valid * page before the end of the upl is reached, if we * find one, then it will be the last page of the request to * 'cluster_io' */ for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) { if (upl_valid_page(pl, last_pg)) break; } iostate.io_completed = 0; iostate.io_issued = 0; iostate.io_error = 0; iostate.io_wanted = 0; if (start_pg < last_pg) { /* * we found a range of 'invalid' pages that must be filled * if the last page in this range is the last page of the file * we may have to clip the size of it to keep from reading past * the end of the last physical block associated with the file */ upl_offset = start_pg * PAGE_SIZE; io_size = (last_pg - start_pg) * PAGE_SIZE; if ((upl_f_offset + upl_offset + io_size) > filesize) io_size = filesize - (upl_f_offset + upl_offset); /* * issue an asynchronous read to cluster_io */ error = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size, devblocksize, CL_READ | CL_ASYNC, (struct buf *)0, &iostate); } if (error == 0) { /* * if the read completed successfully, or there was no I/O request * issued, than copy the data into user land via 'cluster_upl_copy_data' * we'll first add on any 'valid' * pages that were present in the upl when we acquired it. */ u_int val_size; for (uio_last = last_pg; uio_last < pages_in_upl; uio_last++) { if (!upl_valid_page(pl, uio_last)) break; } /* * compute size to transfer this round, if uio->uio_resid is * still non-zero after this attempt, we'll loop around and * set up for another I/O. */ val_size = (uio_last * PAGE_SIZE) - start_offset; if (val_size > max_size) val_size = max_size; if (val_size > uio->uio_resid) val_size = uio->uio_resid; if (last_ioread_offset == 0) last_ioread_offset = uio->uio_offset + val_size; if ((size_of_prefetch = (last_request_offset - last_ioread_offset)) && prefetch_enabled) { /* * if there's still I/O left to do for this request, and... * we're not in hard throttle mode, then issue a * pre-fetch I/O... the I/O latency will overlap * with the copying of the data */ size_of_prefetch = cluster_rd_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize, devblocksize); last_ioread_offset += (off_t)(size_of_prefetch * PAGE_SIZE); if (last_ioread_offset > last_request_offset) last_ioread_offset = last_request_offset; } else if ((uio->uio_offset + val_size) == last_request_offset) { /* * this transfer will finish this request, so... * let's try to read ahead if we're in * a sequential access pattern and we haven't * explicitly disabled it */ if (rd_ahead_enabled) cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize); if (e_lblkno < vp->v_lastr) vp->v_maxra = 0; vp->v_lastr = e_lblkno; } while (iostate.io_issued != iostate.io_completed) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_read_x", 0); } if (iostate.io_error) error = iostate.io_error; else retval = cluster_copy_upl_data(uio, upl, start_offset, val_size); } if (start_pg < last_pg) { /* * compute the range of pages that we actually issued an I/O for * and either commit them as valid if the I/O succeeded * or abort them if the I/O failed */ io_size = (last_pg - start_pg) * PAGE_SIZE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_START, (int)upl, start_pg * PAGE_SIZE, io_size, error, 0); if (error || (vp->v_flag & VNOCACHE_DATA)) ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, io_size, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); else ubc_upl_commit_range(upl, start_pg * PAGE_SIZE, io_size, UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY | UPL_COMMIT_INACTIVATE); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END, (int)upl, start_pg * PAGE_SIZE, io_size, error, 0); } if ((last_pg - start_pg) < pages_in_upl) { int cur_pg; int commit_flags; /* * the set of pages that we issued an I/O for did not encompass * the entire upl... so just release these without modifying * their state */ if (error) ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); else { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_START, (int)upl, -1, pages_in_upl - (last_pg - start_pg), 0, 0); if (start_pg) { /* * we found some already valid pages at the beginning of * the upl commit these back to the inactive list with * reference cleared */ for (cur_pg = 0; cur_pg < start_pg; cur_pg++) { commit_flags = UPL_COMMIT_FREE_ON_EMPTY | UPL_COMMIT_INACTIVATE; if (upl_dirty_page(pl, cur_pg)) commit_flags |= UPL_COMMIT_SET_DIRTY; if ( !(commit_flags & UPL_COMMIT_SET_DIRTY) && (vp->v_flag & VNOCACHE_DATA)) ubc_upl_abort_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); else ubc_upl_commit_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE, commit_flags); } } if (last_pg < uio_last) { /* * we found some already valid pages immediately after the * pages we issued I/O for, commit these back to the * inactive list with reference cleared */ for (cur_pg = last_pg; cur_pg < uio_last; cur_pg++) { commit_flags = UPL_COMMIT_FREE_ON_EMPTY | UPL_COMMIT_INACTIVATE; if (upl_dirty_page(pl, cur_pg)) commit_flags |= UPL_COMMIT_SET_DIRTY; if ( !(commit_flags & UPL_COMMIT_SET_DIRTY) && (vp->v_flag & VNOCACHE_DATA)) ubc_upl_abort_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); else ubc_upl_commit_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE, commit_flags); } } if (uio_last < pages_in_upl) { /* * there were some invalid pages beyond the valid pages * that we didn't issue an I/O for, just release them * unchanged */ ubc_upl_abort_range(upl, uio_last * PAGE_SIZE, (pages_in_upl - uio_last) * PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY); } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END, (int)upl, -1, -1, 0, 0); } } if (retval == 0) retval = error; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END, (int)uio->uio_offset, uio->uio_resid, vp->v_lastr, retval, 0); return (retval); } static int cluster_nocopy_read(vp, uio, filesize, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t filesize; int devblocksize; int flags; { upl_t upl; upl_page_info_t *pl; vm_offset_t upl_offset; off_t max_io_size; int io_size; int upl_size; int upl_needed_size; int pages_in_pl; int upl_flags; kern_return_t kret; struct iovec *iov; int i; int force_data_sync; int retval = 0; struct clios iostate; u_int max_rd_size = MAX_UPL_TRANSFER * PAGE_SIZE; u_int max_rd_ahead = MAX_UPL_TRANSFER * PAGE_SIZE * 2; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_START, (int)uio->uio_offset, uio->uio_resid, (int)filesize, devblocksize, 0); /* * When we enter this routine, we know * -- the offset into the file is on a pagesize boundary * -- the resid is a page multiple * -- the resid will not exceed iov_len */ iostate.io_completed = 0; iostate.io_issued = 0; iostate.io_error = 0; iostate.io_wanted = 0; iov = uio->uio_iov; if (cluster_hard_throttle_on(vp)) { max_rd_size = HARD_THROTTLE_MAXSIZE; max_rd_ahead = HARD_THROTTLE_MAXSIZE - 1; } while (uio->uio_resid && uio->uio_offset < filesize && retval == 0) { max_io_size = filesize - uio->uio_offset; if (max_io_size < (off_t)((unsigned int)uio->uio_resid)) io_size = max_io_size; else io_size = uio->uio_resid; /* * First look for pages already in the cache * and move them to user space. */ retval = cluster_copy_ubc_data(vp, uio, &io_size, 0); if (retval) { /* * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_reads; } /* * If we are already finished with this read, then return */ if (io_size == 0) { /* * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_reads; } max_io_size = io_size; if (max_io_size > max_rd_size) max_io_size = max_rd_size; io_size = 0; ubc_range_op(vp, uio->uio_offset, uio->uio_offset + max_io_size, UPL_ROP_ABSENT, &io_size); if (io_size == 0) /* * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_reads; upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK; upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_START, (int)upl_offset, upl_needed_size, (int)iov->iov_base, io_size, 0); for (force_data_sync = 0; force_data_sync < 3; force_data_sync++) { pages_in_pl = 0; upl_size = upl_needed_size; upl_flags = UPL_FILE_IO | UPL_NO_SYNC | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE; kret = vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, force_data_sync); if (kret != KERN_SUCCESS) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END, (int)upl_offset, upl_size, io_size, kret, 0); /* * cluster_nocopy_read: failed to get pagelist * * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_reads; } pages_in_pl = upl_size / PAGE_SIZE; pl = UPL_GET_INTERNAL_PAGE_LIST(upl); for (i = 0; i < pages_in_pl; i++) { if (!upl_valid_page(pl, i)) break; } if (i == pages_in_pl) break; ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); } if (force_data_sync >= 3) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END, (int)upl_offset, upl_size, io_size, kret, 0); goto wait_for_reads; } /* * Consider the possibility that upl_size wasn't satisfied. */ if (upl_size != upl_needed_size) io_size = (upl_size - (int)upl_offset) & ~PAGE_MASK; if (io_size == 0) { ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); goto wait_for_reads; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END, (int)upl_offset, upl_size, io_size, kret, 0); /* * request asynchronously so that we can overlap * the preparation of the next I/O * if there are already too many outstanding reads * wait until some have completed before issuing the next read */ while ((iostate.io_issued - iostate.io_completed) > max_rd_ahead) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_nocopy_read", 0); } if (iostate.io_error) { /* * one of the earlier reads we issued ran into a hard error * don't issue any more reads, cleanup the UPL * that was just created but not used, then * go wait for any other reads to complete before * returning the error to the caller */ ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); goto wait_for_reads; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_START, (int)upl, (int)upl_offset, (int)uio->uio_offset, io_size, 0); retval = cluster_io(vp, upl, upl_offset, uio->uio_offset, io_size, devblocksize, CL_PRESERVE | CL_COMMIT | CL_READ | CL_ASYNC | CL_NOZERO, (struct buf *)0, &iostate); /* * update the uio structure */ iov->iov_base += io_size; iov->iov_len -= io_size; uio->uio_resid -= io_size; uio->uio_offset += io_size; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_END, (int)upl, (int)uio->uio_offset, (int)uio->uio_resid, retval, 0); } /* end while */ wait_for_reads: /* * make sure all async reads that are part of this stream * have completed before we return */ while (iostate.io_issued != iostate.io_completed) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_nocopy_read", 0); } if (iostate.io_error) retval = iostate.io_error; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_END, (int)uio->uio_offset, (int)uio->uio_resid, 6, retval, 0); return (retval); } static int cluster_phys_read(vp, uio, filesize, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t filesize; int devblocksize; int flags; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; addr64_t dst_paddr; off_t max_size; int io_size; int tail_size; int upl_size; int upl_needed_size; int pages_in_pl; int upl_flags; kern_return_t kret; struct iovec *iov; struct clios iostate; int error; /* * When we enter this routine, we know * -- the resid will not exceed iov_len * -- the target address is physically contiguous */ iov = uio->uio_iov; max_size = filesize - uio->uio_offset; if (max_size > (off_t)((unsigned int)iov->iov_len)) io_size = iov->iov_len; else io_size = max_size; upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK; upl_needed_size = upl_offset + io_size; error = 0; pages_in_pl = 0; upl_size = upl_needed_size; upl_flags = UPL_FILE_IO | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE; kret = vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0); if (kret != KERN_SUCCESS) { /* * cluster_phys_read: failed to get pagelist */ return(EINVAL); } if (upl_size < upl_needed_size) { /* * The upl_size wasn't satisfied. */ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return(EINVAL); } pl = ubc_upl_pageinfo(upl); dst_paddr = ((addr64_t)upl_phys_page(pl, 0) << 12) + ((addr64_t)((u_int)iov->iov_base & PAGE_MASK)); while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) { int head_size; head_size = devblocksize - (int)(uio->uio_offset & (devblocksize - 1)); if (head_size > io_size) head_size = io_size; error = cluster_align_phys_io(vp, uio, dst_paddr, head_size, devblocksize, CL_READ); if (error) { ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return(EINVAL); } upl_offset += head_size; dst_paddr += head_size; io_size -= head_size; } tail_size = io_size & (devblocksize - 1); io_size -= tail_size; iostate.io_completed = 0; iostate.io_issued = 0; iostate.io_error = 0; iostate.io_wanted = 0; while (io_size && error == 0) { int xsize; if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) xsize = MAX_UPL_TRANSFER * PAGE_SIZE; else xsize = io_size; /* * request asynchronously so that we can overlap * the preparation of the next I/O... we'll do * the commit after all the I/O has completed * since its all issued against the same UPL * if there are already too many outstanding reads * wait until some have completed before issuing the next */ while ((iostate.io_issued - iostate.io_completed) > (2 * MAX_UPL_TRANSFER * PAGE_SIZE)) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_phys_read", 0); } error = cluster_io(vp, upl, upl_offset, uio->uio_offset, xsize, 0, CL_READ | CL_NOZERO | CL_DEV_MEMORY | CL_ASYNC, (struct buf *)0, &iostate); /* * The cluster_io read was issued successfully, * update the uio structure */ if (error == 0) { uio->uio_resid -= xsize; iov->iov_len -= xsize; iov->iov_base += xsize; uio->uio_offset += xsize; dst_paddr += xsize; upl_offset += xsize; io_size -= xsize; } } /* * make sure all async reads that are part of this stream * have completed before we proceed */ while (iostate.io_issued != iostate.io_completed) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_phys_read", 0); } if (iostate.io_error) { error = iostate.io_error; } if (error == 0 && tail_size) error = cluster_align_phys_io(vp, uio, dst_paddr, tail_size, devblocksize, CL_READ); /* * just release our hold on the physically contiguous * region without changing any state */ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return (error); } /* * generate advisory I/O's in the largest chunks possible * the completed pages will be released into the VM cache */ int advisory_read(vp, filesize, f_offset, resid, devblocksize) struct vnode *vp; off_t filesize; off_t f_offset; int resid; int devblocksize; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; int upl_size; off_t upl_f_offset; int start_offset; int start_pg; int last_pg; int pages_in_upl; off_t max_size; int io_size; kern_return_t kret; int retval = 0; int issued_io; int skip_range; if (!UBCINFOEXISTS(vp)) return(EINVAL); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_START, (int)f_offset, resid, (int)filesize, devblocksize, 0); while (resid && f_offset < filesize && retval == 0) { /* * compute the size of the upl needed to encompass * the requested read... limit each call to cluster_io * to the maximum UPL size... cluster_io will clip if * this exceeds the maximum io_size for the device, * make sure to account for * a starting offset that's not page aligned */ start_offset = (int)(f_offset & PAGE_MASK_64); upl_f_offset = f_offset - (off_t)start_offset; max_size = filesize - f_offset; if (resid < max_size) io_size = resid; else io_size = max_size; upl_size = (start_offset + io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) upl_size = MAX_UPL_TRANSFER * PAGE_SIZE; skip_range = 0; /* * return the number of contiguously present pages in the cache * starting at upl_f_offset within the file */ ubc_range_op(vp, upl_f_offset, upl_f_offset + upl_size, UPL_ROP_PRESENT, &skip_range); if (skip_range) { /* * skip over pages already present in the cache */ io_size = skip_range - start_offset; f_offset += io_size; resid -= io_size; if (skip_range == upl_size) continue; /* * have to issue some real I/O * at this point, we know it's starting on a page boundary * because we've skipped over at least the first page in the request */ start_offset = 0; upl_f_offset += skip_range; upl_size -= skip_range; } pages_in_upl = upl_size / PAGE_SIZE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 61)) | DBG_FUNC_START, (int)upl, (int)upl_f_offset, upl_size, start_offset, 0); kret = ubc_create_upl(vp, upl_f_offset, upl_size, &upl, &pl, UPL_RET_ONLY_ABSENT | UPL_SET_LITE); if (kret != KERN_SUCCESS) return(retval); issued_io = 0; /* * before we start marching forward, we must make sure we end on * a present page, otherwise we will be working with a freed * upl */ for (last_pg = pages_in_upl - 1; last_pg >= 0; last_pg--) { if (upl_page_present(pl, last_pg)) break; } pages_in_upl = last_pg + 1; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 61)) | DBG_FUNC_END, (int)upl, (int)upl_f_offset, upl_size, start_offset, 0); for (last_pg = 0; last_pg < pages_in_upl; ) { /* * scan from the beginning of the upl looking for the first * page that is present.... this will become the first page in * the request we're going to make to 'cluster_io'... if all * of the pages are absent, we won't call through to 'cluster_io' */ for (start_pg = last_pg; start_pg < pages_in_upl; start_pg++) { if (upl_page_present(pl, start_pg)) break; } /* * scan from the starting present page looking for an absent * page before the end of the upl is reached, if we * find one, then it will terminate the range of pages being * presented to 'cluster_io' */ for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) { if (!upl_page_present(pl, last_pg)) break; } if (last_pg > start_pg) { /* * we found a range of pages that must be filled * if the last page in this range is the last page of the file * we may have to clip the size of it to keep from reading past * the end of the last physical block associated with the file */ upl_offset = start_pg * PAGE_SIZE; io_size = (last_pg - start_pg) * PAGE_SIZE; if ((upl_f_offset + upl_offset + io_size) > filesize) io_size = filesize - (upl_f_offset + upl_offset); /* * issue an asynchronous read to cluster_io */ retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size, devblocksize, CL_ASYNC | CL_READ | CL_COMMIT | CL_AGE, (struct buf *)0, (struct clios *)0); issued_io = 1; } } if (issued_io == 0) ubc_upl_abort(upl, 0); io_size = upl_size - start_offset; if (io_size > resid) io_size = resid; f_offset += io_size; resid -= io_size; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_END, (int)f_offset, resid, retval, 0, 0); return(retval); } int cluster_push(vp) struct vnode *vp; { int retval; if (!UBCINFOEXISTS(vp) || (vp->v_clen == 0 && !(vp->v_flag & VHASDIRTY))) return(0); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_START, vp->v_flag & VHASDIRTY, vp->v_clen, 0, 0, 0); if (vp->v_flag & VHASDIRTY) { sparse_cluster_push(vp, ubc_getsize(vp), 1); vp->v_clen = 0; retval = 1; } else retval = cluster_try_push(vp, ubc_getsize(vp), 0, 1); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_END, vp->v_flag & VHASDIRTY, vp->v_clen, retval, 0, 0); return (retval); } int cluster_release(vp) struct vnode *vp; { off_t offset; u_int length; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 81)) | DBG_FUNC_START, (int)vp, (int)vp->v_scmap, vp->v_scdirty, 0, 0); if (vp->v_flag & VHASDIRTY) { vfs_drt_control(&(vp->v_scmap), 0); vp->v_flag &= ~VHASDIRTY; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 81)) | DBG_FUNC_END, (int)vp, (int)vp->v_scmap, vp->v_scdirty, 0, 0); } static int cluster_try_push(vp, EOF, can_delay, push_all) struct vnode *vp; off_t EOF; int can_delay; int push_all; { int cl_index; int cl_index1; int min_index; int cl_len; int cl_total; int cl_pushed = 0; struct v_cluster l_clusters[MAX_CLUSTERS]; /* * make a local 'sorted' copy of the clusters * and clear vp->v_clen so that new clusters can * be developed */ for (cl_index = 0; cl_index < vp->v_clen; cl_index++) { for (min_index = -1, cl_index1 = 0; cl_index1 < vp->v_clen; cl_index1++) { if (vp->v_clusters[cl_index1].start_pg == vp->v_clusters[cl_index1].last_pg) continue; if (min_index == -1) min_index = cl_index1; else if (vp->v_clusters[cl_index1].start_pg < vp->v_clusters[min_index].start_pg) min_index = cl_index1; } if (min_index == -1) break; l_clusters[cl_index].start_pg = vp->v_clusters[min_index].start_pg; l_clusters[cl_index].last_pg = vp->v_clusters[min_index].last_pg; vp->v_clusters[min_index].start_pg = vp->v_clusters[min_index].last_pg; } cl_len = cl_index; vp->v_clen = 0; if (can_delay && cl_len == MAX_CLUSTERS) { int i; /* * determine if we appear to be writing the file sequentially * if not, by returning without having pushed any clusters * we will cause this vnode to be pushed into the sparse cluster mechanism * used for managing more random I/O patterns * * we know that we've got all clusters currently in use and the next write doesn't fit into one of them... * that's why we're in try_push with can_delay true... * * check to make sure that all the clusters except the last one are 'full'... and that each cluster * is adjacent to the next (i.e. we're looking for sequential writes) they were sorted above * so we can just make a simple pass through up, to but not including the last one... * note that last_pg is not inclusive, so it will be equal to the start_pg of the next cluster if they * are sequential * * we let the last one be partial as long as it was adjacent to the previous one... * we need to do this to deal with multi-threaded servers that might write an I/O or 2 out * of order... if this occurs at the tail of the last cluster, we don't want to fall into the sparse cluster world... */ for (i = 0; i < MAX_CLUSTERS - 1; i++) { if ((l_clusters[i].last_pg - l_clusters[i].start_pg) != MAX_UPL_TRANSFER) goto dont_try; if (l_clusters[i].last_pg != l_clusters[i+1].start_pg) goto dont_try; } } for (cl_index = 0; cl_index < cl_len; cl_index++) { /* * try to push each cluster in turn... cluster_push_x may not * push the cluster if can_delay is TRUE and the cluster doesn't * meet the critera for an immediate push */ if (cluster_push_x(vp, EOF, l_clusters[cl_index].start_pg, l_clusters[cl_index].last_pg, can_delay)) { l_clusters[cl_index].start_pg = 0; l_clusters[cl_index].last_pg = 0; cl_pushed++; if (push_all == 0) break; } } dont_try: if (cl_len > cl_pushed) { /* * we didn't push all of the clusters, so * lets try to merge them back in to the vnode */ if ((MAX_CLUSTERS - vp->v_clen) < (cl_len - cl_pushed)) { /* * we picked up some new clusters while we were trying to * push the old ones (I don't think this can happen because * I'm holding the lock, but just in case)... the sum of the * leftovers plus the new cluster count exceeds our ability * to represent them, so switch to the sparse cluster mechanism */ /* * first collect the new clusters sitting in the vp */ sparse_cluster_switch(vp, EOF); for (cl_index = 0, cl_index1 = 0; cl_index < cl_len; cl_index++) { if (l_clusters[cl_index].start_pg == l_clusters[cl_index].last_pg) continue; vp->v_clusters[cl_index1].start_pg = l_clusters[cl_index].start_pg; vp->v_clusters[cl_index1].last_pg = l_clusters[cl_index].last_pg; cl_index1++; } /* * update the cluster count */ vp->v_clen = cl_index1; /* * and collect the original clusters that were moved into the * local storage for sorting purposes */ sparse_cluster_switch(vp, EOF); } else { /* * we've got room to merge the leftovers back in * just append them starting at the next 'hole' * represented by vp->v_clen */ for (cl_index = 0, cl_index1 = vp->v_clen; cl_index < cl_len; cl_index++) { if (l_clusters[cl_index].start_pg == l_clusters[cl_index].last_pg) continue; vp->v_clusters[cl_index1].start_pg = l_clusters[cl_index].start_pg; vp->v_clusters[cl_index1].last_pg = l_clusters[cl_index].last_pg; cl_index1++; } /* * update the cluster count */ vp->v_clen = cl_index1; } } return(MAX_CLUSTERS - vp->v_clen); } static int cluster_push_x(vp, EOF, first, last, can_delay) struct vnode *vp; off_t EOF; unsigned int first; unsigned int last; int can_delay; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; int upl_size; off_t upl_f_offset; int pages_in_upl; int start_pg; int last_pg; int io_size; int io_flags; int upl_flags; int size; kern_return_t kret; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_START, vp->v_clen, first, last, EOF, 0); if ((pages_in_upl = last - first) == 0) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 0, 0, 0, 0); return (1); } upl_size = pages_in_upl * PAGE_SIZE; upl_f_offset = (off_t)((unsigned long long)first * PAGE_SIZE_64); if (upl_f_offset + upl_size >= EOF) { if (upl_f_offset >= EOF) { /* * must have truncated the file and missed * clearing a dangling cluster (i.e. it's completely * beyond the new EOF */ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 1, 0, 0, 0); return(1); } size = EOF - upl_f_offset; upl_size = (size + (PAGE_SIZE - 1)) & ~PAGE_MASK; pages_in_upl = upl_size / PAGE_SIZE; } else size = upl_size; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_START, upl_size, size, 0, 0, 0); if (vp->v_flag & VNOCACHE_DATA) upl_flags = UPL_COPYOUT_FROM | UPL_RET_ONLY_DIRTY | UPL_SET_LITE | UPL_WILL_BE_DUMPED; else upl_flags = UPL_COPYOUT_FROM | UPL_RET_ONLY_DIRTY | UPL_SET_LITE; kret = ubc_create_upl(vp, upl_f_offset, upl_size, &upl, &pl, upl_flags); if (kret != KERN_SUCCESS) panic("cluster_push: failed to get pagelist"); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_END, (int)upl, upl_f_offset, 0, 0, 0); /* * since we only asked for the dirty pages back * it's possible that we may only get a few or even none, so... * before we start marching forward, we must make sure we know * where the last present page is in the UPL, otherwise we could * end up working with a freed upl due to the FREE_ON_EMPTY semantics * employed by commit_range and abort_range. */ for (last_pg = pages_in_upl - 1; last_pg >= 0; last_pg--) { if (upl_page_present(pl, last_pg)) break; } pages_in_upl = last_pg + 1; if (pages_in_upl == 0) { ubc_upl_abort(upl, 0); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 2, 0, 0, 0); return(1); } for (last_pg = 0; last_pg < pages_in_upl; ) { /* * find the next dirty page in the UPL * this will become the first page in the * next I/O to generate */ for (start_pg = last_pg; start_pg < pages_in_upl; start_pg++) { if (upl_dirty_page(pl, start_pg)) break; if (upl_page_present(pl, start_pg)) /* * RET_ONLY_DIRTY will return non-dirty 'precious' pages * just release these unchanged since we're not going * to steal them or change their state */ ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY); } if (start_pg >= pages_in_upl) /* * done... no more dirty pages to push */ break; if (start_pg > last_pg) /* * skipped over some non-dirty pages */ size -= ((start_pg - last_pg) * PAGE_SIZE); /* * find a range of dirty pages to write */ for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) { if (!upl_dirty_page(pl, last_pg)) break; } upl_offset = start_pg * PAGE_SIZE; io_size = min(size, (last_pg - start_pg) * PAGE_SIZE); if (vp->v_flag & VNOCACHE_DATA) io_flags = CL_THROTTLE | CL_COMMIT | CL_ASYNC | CL_DUMP; else io_flags = CL_THROTTLE | CL_COMMIT | CL_ASYNC; cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size, vp->v_ciosiz, io_flags, (struct buf *)0, (struct clios *)0); size -= io_size; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 3, 0, 0, 0); return(1); } static int sparse_cluster_switch(struct vnode *vp, off_t EOF) { int cl_index; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 78)) | DBG_FUNC_START, (int)vp, (int)vp->v_scmap, vp->v_scdirty, 0, 0); if ( !(vp->v_flag & VHASDIRTY)) { vp->v_flag |= VHASDIRTY; vp->v_scdirty = 0; vp->v_scmap = 0; } for (cl_index = 0; cl_index < vp->v_clen; cl_index++) { int flags; int start_pg; int last_pg; for (start_pg = vp->v_clusters[cl_index].start_pg; start_pg < vp->v_clusters[cl_index].last_pg; start_pg++) { if (ubc_page_op(vp, (off_t)(((off_t)start_pg) * PAGE_SIZE_64), 0, 0, &flags) == KERN_SUCCESS) { if (flags & UPL_POP_DIRTY) sparse_cluster_add(vp, EOF, start_pg, start_pg + 1); } } } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 78)) | DBG_FUNC_END, (int)vp, (int)vp->v_scmap, vp->v_scdirty, 0, 0); } static int sparse_cluster_push(struct vnode *vp, off_t EOF, int push_all) { unsigned int first; unsigned int last; off_t offset; u_int length; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_START, (int)vp, (int)vp->v_scmap, vp->v_scdirty, push_all, 0); if (push_all) vfs_drt_control(&(vp->v_scmap), 1); for (;;) { if (vfs_drt_get_cluster(&(vp->v_scmap), &offset, &length) != KERN_SUCCESS) { vp->v_flag &= ~VHASDIRTY; vp->v_clen = 0; break; } first = (unsigned int)(offset / PAGE_SIZE_64); last = (unsigned int)((offset + length) / PAGE_SIZE_64); cluster_push_x(vp, EOF, first, last, 0); vp->v_scdirty -= (last - first); if (push_all == 0) break; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_END, (int)vp, (int)vp->v_scmap, vp->v_scdirty, 0, 0); } static int sparse_cluster_add(struct vnode *vp, off_t EOF, daddr_t first, daddr_t last) { u_int new_dirty; u_int length; off_t offset; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 80)) | DBG_FUNC_START, (int)vp->v_scmap, vp->v_scdirty, first, last, 0); offset = (off_t)first * PAGE_SIZE_64; length = (last - first) * PAGE_SIZE; while (vfs_drt_mark_pages(&(vp->v_scmap), offset, length, &new_dirty) != KERN_SUCCESS) { /* * no room left in the map * only a partial update was done * push out some pages and try again */ vp->v_scdirty += new_dirty; sparse_cluster_push(vp, EOF, 0); offset += (new_dirty * PAGE_SIZE_64); length -= (new_dirty * PAGE_SIZE); } vp->v_scdirty += new_dirty; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 80)) | DBG_FUNC_END, (int)vp, (int)vp->v_scmap, vp->v_scdirty, 0, 0); } static int cluster_align_phys_io(struct vnode *vp, struct uio *uio, addr64_t usr_paddr, int xsize, int devblocksize, int flags) { struct iovec *iov; upl_page_info_t *pl; upl_t upl; addr64_t ubc_paddr; kern_return_t kret; int error = 0; iov = uio->uio_iov; kret = ubc_create_upl(vp, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE, &upl, &pl, UPL_SET_LITE); if (kret != KERN_SUCCESS) return(EINVAL); if (!upl_valid_page(pl, 0)) { /* * issue a synchronous read to cluster_io */ error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE, devblocksize, CL_READ, (struct buf *)0, (struct clios *)0); if (error) { ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); return(error); } } ubc_paddr = ((addr64_t)upl_phys_page(pl, 0) << 12) + (addr64_t)(uio->uio_offset & PAGE_MASK_64); /* * NOTE: There is no prototype for the following in BSD. It, and the definitions * of the defines for cppvPsrc, cppvPsnk, cppvFsnk, and cppvFsrc will be found in * osfmk/ppc/mappings.h. They are not included here because there appears to be no * way to do so without exporting them to kexts as well. */ if (flags & CL_READ) // copypv(ubc_paddr, usr_paddr, xsize, cppvPsrc | cppvPsnk | cppvFsnk); /* Copy physical to physical and flush the destination */ copypv(ubc_paddr, usr_paddr, xsize, 2 | 1 | 4); /* Copy physical to physical and flush the destination */ else // copypv(usr_paddr, ubc_paddr, xsize, cppvPsrc | cppvPsnk | cppvFsrc); /* Copy physical to physical and flush the source */ copypv(usr_paddr, ubc_paddr, xsize, 2 | 1 | 8); /* Copy physical to physical and flush the source */ if ( !(flags & CL_READ) || (upl_valid_page(pl, 0) && upl_dirty_page(pl, 0))) { /* * issue a synchronous write to cluster_io */ error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE, devblocksize, 0, (struct buf *)0, (struct clios *)0); } if (error == 0) { uio->uio_offset += xsize; iov->iov_base += xsize; iov->iov_len -= xsize; uio->uio_resid -= xsize; } ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); return (error); } int cluster_copy_upl_data(struct uio *uio, upl_t upl, int upl_offset, int xsize) { int pg_offset; int pg_index; int csize; int segflg; int retval = 0; upl_page_info_t *pl; boolean_t funnel_state = FALSE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START, (int)uio->uio_offset, uio->uio_resid, upl_offset, xsize, 0); if (xsize >= (16 * 1024)) funnel_state = thread_funnel_set(kernel_flock, FALSE); segflg = uio->uio_segflg; switch(segflg) { case UIO_USERSPACE: case UIO_USERISPACE: uio->uio_segflg = UIO_PHYS_USERSPACE; break; case UIO_SYSSPACE: uio->uio_segflg = UIO_PHYS_SYSSPACE; break; } pl = ubc_upl_pageinfo(upl); pg_index = upl_offset / PAGE_SIZE; pg_offset = upl_offset & PAGE_MASK; csize = min(PAGE_SIZE - pg_offset, xsize); while (xsize && retval == 0) { addr64_t paddr; paddr = ((addr64_t)upl_phys_page(pl, pg_index) << 12) + pg_offset; retval = uiomove64(paddr, csize, uio); pg_index += 1; pg_offset = 0; xsize -= csize; csize = min(PAGE_SIZE, xsize); } uio->uio_segflg = segflg; if (funnel_state == TRUE) thread_funnel_set(kernel_flock, TRUE); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END, (int)uio->uio_offset, uio->uio_resid, retval, segflg, 0); return (retval); } int cluster_copy_ubc_data(struct vnode *vp, struct uio *uio, int *io_resid, int mark_dirty) { int segflg; int io_size; int xsize; int start_offset; off_t f_offset; int retval = 0; memory_object_control_t control; int op_flags = UPL_POP_SET | UPL_POP_BUSY; boolean_t funnel_state = FALSE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START, (int)uio->uio_offset, uio->uio_resid, 0, *io_resid, 0); control = ubc_getobject(vp, UBC_FLAGS_NONE); if (control == MEMORY_OBJECT_CONTROL_NULL) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END, (int)uio->uio_offset, uio->uio_resid, retval, 3, 0); return(0); } if (mark_dirty) op_flags |= UPL_POP_DIRTY; segflg = uio->uio_segflg; switch(segflg) { case UIO_USERSPACE: case UIO_USERISPACE: uio->uio_segflg = UIO_PHYS_USERSPACE; break; case UIO_SYSSPACE: uio->uio_segflg = UIO_PHYS_SYSSPACE; break; } io_size = *io_resid; start_offset = (int)(uio->uio_offset & PAGE_MASK_64); f_offset = uio->uio_offset - start_offset; xsize = min(PAGE_SIZE - start_offset, io_size); while (io_size && retval == 0) { ppnum_t pgframe; if (ubc_page_op_with_control(control, f_offset, op_flags, &pgframe, 0) != KERN_SUCCESS) break; if (funnel_state == FALSE && io_size >= (16 * 1024)) funnel_state = thread_funnel_set(kernel_flock, FALSE); retval = uiomove64((addr64_t)(((addr64_t)pgframe << 12) + start_offset), xsize, uio); ubc_page_op_with_control(control, f_offset, UPL_POP_CLR | UPL_POP_BUSY, 0, 0); io_size -= xsize; start_offset = 0; f_offset = uio->uio_offset; xsize = min(PAGE_SIZE, io_size); } uio->uio_segflg = segflg; *io_resid = io_size; if (funnel_state == TRUE) thread_funnel_set(kernel_flock, TRUE); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END, (int)uio->uio_offset, uio->uio_resid, retval, 0x80000000 | segflg, 0); return(retval); } int is_file_clean(struct vnode *vp, off_t filesize) { off_t f_offset; int flags; int total_dirty = 0; for (f_offset = 0; f_offset < filesize; f_offset += PAGE_SIZE_64) { if (ubc_page_op(vp, f_offset, 0, 0, &flags) == KERN_SUCCESS) { if (flags & UPL_POP_DIRTY) { total_dirty++; } } } if (total_dirty) return(EINVAL); return (0); } /* * Dirty region tracking/clustering mechanism. * * This code (vfs_drt_*) provides a mechanism for tracking and clustering * dirty regions within a larger space (file). It is primarily intended to * support clustering in large files with many dirty areas. * * The implementation assumes that the dirty regions are pages. * * To represent dirty pages within the file, we store bit vectors in a * variable-size circular hash. */ /* * Bitvector size. This determines the number of pages we group in a * single hashtable entry. Each hashtable entry is aligned to this * size within the file. */ #define DRT_BITVECTOR_PAGES 256 /* * File offset handling. * * DRT_ADDRESS_MASK is dependent on DRT_BITVECTOR_PAGES; * the correct formula is (~(DRT_BITVECTOR_PAGES * PAGE_SIZE) - 1) */ #define DRT_ADDRESS_MASK (~((1 << 20) - 1)) #define DRT_ALIGN_ADDRESS(addr) ((addr) & DRT_ADDRESS_MASK) /* * Hashtable address field handling. * * The low-order bits of the hashtable address are used to conserve * space. * * DRT_HASH_COUNT_MASK must be large enough to store the range * 0-DRT_BITVECTOR_PAGES inclusive, as well as have one value * to indicate that the bucket is actually unoccupied. */ #define DRT_HASH_GET_ADDRESS(scm, i) ((scm)->scm_hashtable[(i)].dhe_control & DRT_ADDRESS_MASK) #define DRT_HASH_SET_ADDRESS(scm, i, a) \ do { \ (scm)->scm_hashtable[(i)].dhe_control = \ ((scm)->scm_hashtable[(i)].dhe_control & ~DRT_ADDRESS_MASK) | DRT_ALIGN_ADDRESS(a); \ } while (0) #define DRT_HASH_COUNT_MASK 0x1ff #define DRT_HASH_GET_COUNT(scm, i) ((scm)->scm_hashtable[(i)].dhe_control & DRT_HASH_COUNT_MASK) #define DRT_HASH_SET_COUNT(scm, i, c) \ do { \ (scm)->scm_hashtable[(i)].dhe_control = \ ((scm)->scm_hashtable[(i)].dhe_control & ~DRT_HASH_COUNT_MASK) | ((c) & DRT_HASH_COUNT_MASK); \ } while (0) #define DRT_HASH_CLEAR(scm, i) \ do { \ (scm)->scm_hashtable[(i)].dhe_control = 0; \ } while (0) #define DRT_HASH_VACATE(scm, i) DRT_HASH_SET_COUNT((scm), (i), DRT_HASH_COUNT_MASK) #define DRT_HASH_VACANT(scm, i) (DRT_HASH_GET_COUNT((scm), (i)) == DRT_HASH_COUNT_MASK) #define DRT_HASH_COPY(oscm, oi, scm, i) \ do { \ (scm)->scm_hashtable[(i)].dhe_control = (oscm)->scm_hashtable[(oi)].dhe_control; \ DRT_BITVECTOR_COPY(oscm, oi, scm, i); \ } while(0); /* * Hash table moduli. * * Since the hashtable entry's size is dependent on the size of * the bitvector, and since the hashtable size is constrained to * both being prime and fitting within the desired allocation * size, these values need to be manually determined. * * For DRT_BITVECTOR_SIZE = 256, the entry size is 40 bytes. * * The small hashtable allocation is 1024 bytes, so the modulus is 23. * The large hashtable allocation is 16384 bytes, so the modulus is 401. */ #define DRT_HASH_SMALL_MODULUS 23 #define DRT_HASH_LARGE_MODULUS 401 #define DRT_SMALL_ALLOCATION 1024 /* 104 bytes spare */ #define DRT_LARGE_ALLOCATION 16384 /* 344 bytes spare */ /* *** nothing below here has secret dependencies on DRT_BITVECTOR_PAGES *** */ /* * Hashtable bitvector handling. * * Bitvector fields are 32 bits long. */ #define DRT_HASH_SET_BIT(scm, i, bit) \ (scm)->scm_hashtable[(i)].dhe_bitvector[(bit) / 32] |= (1 << ((bit) % 32)) #define DRT_HASH_CLEAR_BIT(scm, i, bit) \ (scm)->scm_hashtable[(i)].dhe_bitvector[(bit) / 32] &= ~(1 << ((bit) % 32)) #define DRT_HASH_TEST_BIT(scm, i, bit) \ ((scm)->scm_hashtable[(i)].dhe_bitvector[(bit) / 32] & (1 << ((bit) % 32))) #define DRT_BITVECTOR_CLEAR(scm, i) \ bzero(&(scm)->scm_hashtable[(i)].dhe_bitvector[0], (DRT_BITVECTOR_PAGES / 32) * sizeof(u_int32_t)) #define DRT_BITVECTOR_COPY(oscm, oi, scm, i) \ bcopy(&(oscm)->scm_hashtable[(oi)].dhe_bitvector[0], \ &(scm)->scm_hashtable[(i)].dhe_bitvector[0], \ (DRT_BITVECTOR_PAGES / 32) * sizeof(u_int32_t)) /* * Hashtable entry. */ struct vfs_drt_hashentry { u_int64_t dhe_control; u_int32_t dhe_bitvector[DRT_BITVECTOR_PAGES / 32]; }; /* * Dirty Region Tracking structure. * * The hashtable is allocated entirely inside the DRT structure. * * The hash is a simple circular prime modulus arrangement, the structure * is resized from small to large if it overflows. */ struct vfs_drt_clustermap { u_int32_t scm_magic; /* sanity/detection */ #define DRT_SCM_MAGIC 0x12020003 u_int32_t scm_modulus; /* current ring size */ u_int32_t scm_buckets; /* number of occupied buckets */ u_int32_t scm_lastclean; /* last entry we cleaned */ u_int32_t scm_iskips; /* number of slot skips */ struct vfs_drt_hashentry scm_hashtable[0]; }; #define DRT_HASH(scm, addr) ((addr) % (scm)->scm_modulus) #define DRT_HASH_NEXT(scm, addr) (((addr) + 1) % (scm)->scm_modulus) /* * Debugging codes and arguments. */ #define DRT_DEBUG_EMPTYFREE (FSDBG_CODE(DBG_FSRW, 82)) /* nil */ #define DRT_DEBUG_RETCLUSTER (FSDBG_CODE(DBG_FSRW, 83)) /* offset, length */ #define DRT_DEBUG_ALLOC (FSDBG_CODE(DBG_FSRW, 84)) /* copycount */ #define DRT_DEBUG_INSERT (FSDBG_CODE(DBG_FSRW, 85)) /* offset, iskip */ #define DRT_DEBUG_MARK (FSDBG_CODE(DBG_FSRW, 86)) /* offset, length, * dirty */ /* 0, setcount */ /* 1 (clean, no map) */ /* 2 (map alloc fail) */ /* 3, resid (partial) */ #define DRT_DEBUG_6 (FSDBG_CODE(DBG_FSRW, 87)) #define DRT_DEBUG_SCMDATA (FSDBG_CODE(DBG_FSRW, 88)) /* modulus, buckets, * lastclean, iskips */ static void vfs_drt_sanity(struct vfs_drt_clustermap *cmap); static kern_return_t vfs_drt_alloc_map(struct vfs_drt_clustermap **cmapp); static kern_return_t vfs_drt_free_map(struct vfs_drt_clustermap *cmap); static kern_return_t vfs_drt_search_index(struct vfs_drt_clustermap *cmap, u_int64_t offset, int *indexp); static kern_return_t vfs_drt_get_index(struct vfs_drt_clustermap **cmapp, u_int64_t offset, int *indexp, int recursed); static kern_return_t vfs_drt_do_mark_pages( void **cmapp, u_int64_t offset, u_int length, int *setcountp, int dirty); static void vfs_drt_trace( struct vfs_drt_clustermap *cmap, int code, int arg1, int arg2, int arg3, int arg4); /* * Allocate and initialise a sparse cluster map. * * Will allocate a new map, resize or compact an existing map. * * XXX we should probably have at least one intermediate map size, * as the 1:16 ratio seems a bit drastic. */ static kern_return_t vfs_drt_alloc_map(struct vfs_drt_clustermap **cmapp) { struct vfs_drt_clustermap *cmap, *ocmap; kern_return_t kret; u_int64_t offset; int nsize, i, active_buckets, index, copycount; ocmap = NULL; if (cmapp != NULL) ocmap = *cmapp; /* * Decide on the size of the new map. */ if (ocmap == NULL) { nsize = DRT_HASH_SMALL_MODULUS; } else { /* count the number of active buckets in the old map */ active_buckets = 0; for (i = 0; i < ocmap->scm_modulus; i++) { if (!DRT_HASH_VACANT(ocmap, i) && (DRT_HASH_GET_COUNT(ocmap, i) != 0)) active_buckets++; } /* * If we're currently using the small allocation, check to * see whether we should grow to the large one. */ if (ocmap->scm_modulus == DRT_HASH_SMALL_MODULUS) { /* if the ring is nearly full */ if (active_buckets > (DRT_HASH_SMALL_MODULUS - 5)) { nsize = DRT_HASH_LARGE_MODULUS; } else { nsize = DRT_HASH_SMALL_MODULUS; } } else { /* already using the large modulus */ nsize = DRT_HASH_LARGE_MODULUS; /* * If the ring is completely full, there's * nothing useful for us to do. Behave as * though we had compacted into the new * array and return. */ if (active_buckets >= DRT_HASH_LARGE_MODULUS) return(KERN_SUCCESS); } } /* * Allocate and initialise the new map. */ kret = kmem_alloc(kernel_map, (vm_offset_t *)&cmap, (nsize == DRT_HASH_SMALL_MODULUS) ? DRT_SMALL_ALLOCATION : DRT_LARGE_ALLOCATION); if (kret != KERN_SUCCESS) return(kret); cmap->scm_magic = DRT_SCM_MAGIC; cmap->scm_modulus = nsize; cmap->scm_buckets = 0; cmap->scm_lastclean = 0; cmap->scm_iskips = 0; for (i = 0; i < cmap->scm_modulus; i++) { DRT_HASH_CLEAR(cmap, i); DRT_HASH_VACATE(cmap, i); DRT_BITVECTOR_CLEAR(cmap, i); } /* * If there's an old map, re-hash entries from it into the new map. */ copycount = 0; if (ocmap != NULL) { for (i = 0; i < ocmap->scm_modulus; i++) { /* skip empty buckets */ if (DRT_HASH_VACANT(ocmap, i) || (DRT_HASH_GET_COUNT(ocmap, i) == 0)) continue; /* get new index */ offset = DRT_HASH_GET_ADDRESS(ocmap, i); kret = vfs_drt_get_index(&cmap, offset, &index, 1); if (kret != KERN_SUCCESS) { /* XXX need to bail out gracefully here */ panic("vfs_drt: new cluster map mysteriously too small"); } /* copy */ DRT_HASH_COPY(ocmap, i, cmap, index); copycount++; } } /* log what we've done */ vfs_drt_trace(cmap, DRT_DEBUG_ALLOC, copycount, 0, 0, 0); /* * It's important to ensure that *cmapp always points to * a valid map, so we must overwrite it before freeing * the old map. */ *cmapp = cmap; if (ocmap != NULL) { /* emit stats into trace buffer */ vfs_drt_trace(ocmap, DRT_DEBUG_SCMDATA, ocmap->scm_modulus, ocmap->scm_buckets, ocmap->scm_lastclean, ocmap->scm_iskips); vfs_drt_free_map(ocmap); } return(KERN_SUCCESS); } /* * Free a sparse cluster map. */ static kern_return_t vfs_drt_free_map(struct vfs_drt_clustermap *cmap) { kern_return_t ret; kmem_free(kernel_map, (vm_offset_t)cmap, (cmap->scm_modulus == DRT_HASH_SMALL_MODULUS) ? DRT_SMALL_ALLOCATION : DRT_LARGE_ALLOCATION); return(KERN_SUCCESS); } /* * Find the hashtable slot currently occupied by an entry for the supplied offset. */ static kern_return_t vfs_drt_search_index(struct vfs_drt_clustermap *cmap, u_int64_t offset, int *indexp) { kern_return_t kret; int index, i, tries; offset = DRT_ALIGN_ADDRESS(offset); index = DRT_HASH(cmap, offset); /* traverse the hashtable */ for (i = 0; i < cmap->scm_modulus; i++) { /* * If the slot is vacant, we can stop. */ if (DRT_HASH_VACANT(cmap, index)) break; /* * If the address matches our offset, we have success. */ if (DRT_HASH_GET_ADDRESS(cmap, index) == offset) { *indexp = index; return(KERN_SUCCESS); } /* * Move to the next slot, try again. */ index = DRT_HASH_NEXT(cmap, index); } /* * It's not there. */ return(KERN_FAILURE); } /* * Find the hashtable slot for the supplied offset. If we haven't allocated * one yet, allocate one and populate the address field. Note that it will * not have a nonzero page count and thus will still technically be free, so * in the case where we are called to clean pages, the slot will remain free. */ static kern_return_t vfs_drt_get_index(struct vfs_drt_clustermap **cmapp, u_int64_t offset, int *indexp, int recursed) { struct vfs_drt_clustermap *cmap; kern_return_t kret; int index, i; cmap = *cmapp; /* look for an existing entry */ kret = vfs_drt_search_index(cmap, offset, indexp); if (kret == KERN_SUCCESS) return(kret); /* need to allocate an entry */ offset = DRT_ALIGN_ADDRESS(offset); index = DRT_HASH(cmap, offset); /* scan from the index forwards looking for a vacant slot */ for (i = 0; i < cmap->scm_modulus; i++) { /* slot vacant? */ if (DRT_HASH_VACANT(cmap, index) || DRT_HASH_GET_COUNT(cmap,index) == 0) { cmap->scm_buckets++; if (index < cmap->scm_lastclean) cmap->scm_lastclean = index; DRT_HASH_SET_ADDRESS(cmap, index, offset); DRT_HASH_SET_COUNT(cmap, index, 0); DRT_BITVECTOR_CLEAR(cmap, index); *indexp = index; vfs_drt_trace(cmap, DRT_DEBUG_INSERT, (int)offset, i, 0, 0); return(KERN_SUCCESS); } cmap->scm_iskips += i; index = DRT_HASH_NEXT(cmap, index); } /* * We haven't found a vacant slot, so the map is full. If we're not * already recursed, try reallocating/compacting it. */ if (recursed) return(KERN_FAILURE); kret = vfs_drt_alloc_map(cmapp); if (kret == KERN_SUCCESS) { /* now try to insert again */ kret = vfs_drt_get_index(cmapp, offset, indexp, 1); } return(kret); } /* * Implementation of set dirty/clean. * * In the 'clean' case, not finding a map is OK. */ static kern_return_t vfs_drt_do_mark_pages( void **private, u_int64_t offset, u_int length, int *setcountp, int dirty) { struct vfs_drt_clustermap *cmap, **cmapp; kern_return_t kret; int i, index, pgoff, pgcount, setcount, ecount; cmapp = (struct vfs_drt_clustermap **)private; cmap = *cmapp; vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_START, (int)offset, (int)length, dirty, 0); if (setcountp != NULL) *setcountp = 0; /* allocate a cluster map if we don't already have one */ if (cmap == NULL) { /* no cluster map, nothing to clean */ if (!dirty) { vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_END, 1, 0, 0, 0); return(KERN_SUCCESS); } kret = vfs_drt_alloc_map(cmapp); if (kret != KERN_SUCCESS) { vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_END, 2, 0, 0, 0); return(kret); } } setcount = 0; /* * Iterate over the length of the region. */ while (length > 0) { /* * Get the hashtable index for this offset. * * XXX this will add blank entries if we are clearing a range * that hasn't been dirtied. */ kret = vfs_drt_get_index(cmapp, offset, &index, 0); cmap = *cmapp; /* may have changed! */ /* this may be a partial-success return */ if (kret != KERN_SUCCESS) { if (setcountp != NULL) *setcountp = setcount; vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_END, 3, (int)length, 0, 0); return(kret); } /* * Work out how many pages we're modifying in this * hashtable entry. */ pgoff = (offset - DRT_ALIGN_ADDRESS(offset)) / PAGE_SIZE; pgcount = min((length / PAGE_SIZE), (DRT_BITVECTOR_PAGES - pgoff)); /* * Iterate over pages, dirty/clearing as we go. */ ecount = DRT_HASH_GET_COUNT(cmap, index); for (i = 0; i < pgcount; i++) { if (dirty) { if (!DRT_HASH_TEST_BIT(cmap, index, pgoff + i)) { DRT_HASH_SET_BIT(cmap, index, pgoff + i); ecount++; setcount++; } } else { if (DRT_HASH_TEST_BIT(cmap, index, pgoff + i)) { DRT_HASH_CLEAR_BIT(cmap, index, pgoff + i); ecount--; setcount++; } } } DRT_HASH_SET_COUNT(cmap, index, ecount); next: offset += pgcount * PAGE_SIZE; length -= pgcount * PAGE_SIZE; } if (setcountp != NULL) *setcountp = setcount; vfs_drt_trace(cmap, DRT_DEBUG_MARK | DBG_FUNC_END, 0, setcount, 0, 0); return(KERN_SUCCESS); } /* * Mark a set of pages as dirty/clean. * * This is a public interface. * * cmapp * Pointer to storage suitable for holding a pointer. Note that * this must either be NULL or a value set by this function. * * size * Current file size in bytes. * * offset * Offset of the first page to be marked as dirty, in bytes. Must be * page-aligned. * * length * Length of dirty region, in bytes. Must be a multiple of PAGE_SIZE. * * setcountp * Number of pages newly marked dirty by this call (optional). * * Returns KERN_SUCCESS if all the pages were successfully marked. */ static kern_return_t vfs_drt_mark_pages(void **cmapp, off_t offset, u_int length, int *setcountp) { /* XXX size unused, drop from interface */ return(vfs_drt_do_mark_pages(cmapp, offset, length, setcountp, 1)); } static kern_return_t vfs_drt_unmark_pages(void **cmapp, off_t offset, u_int length) { return(vfs_drt_do_mark_pages(cmapp, offset, length, NULL, 0)); } /* * Get a cluster of dirty pages. * * This is a public interface. * * cmapp * Pointer to storage managed by drt_mark_pages. Note that this must * be NULL or a value set by drt_mark_pages. * * offsetp * Returns the byte offset into the file of the first page in the cluster. * * lengthp * Returns the length in bytes of the cluster of dirty pages. * * Returns success if a cluster was found. If KERN_FAILURE is returned, there * are no dirty pages meeting the minmum size criteria. Private storage will * be released if there are no more dirty pages left in the map * */ static kern_return_t vfs_drt_get_cluster(void **cmapp, off_t *offsetp, u_int *lengthp) { struct vfs_drt_clustermap *cmap; u_int64_t offset; u_int length; int index, i, j, fs, ls; /* sanity */ if ((cmapp == NULL) || (*cmapp == NULL)) return(KERN_FAILURE); cmap = *cmapp; /* walk the hashtable */ for (offset = 0, j = 0; j < cmap->scm_modulus; offset += (DRT_BITVECTOR_PAGES * PAGE_SIZE), j++) { index = DRT_HASH(cmap, offset); if (DRT_HASH_VACANT(cmap, index) || (DRT_HASH_GET_COUNT(cmap, index) == 0)) continue; /* scan the bitfield for a string of bits */ fs = -1; for (i = 0; i < DRT_BITVECTOR_PAGES; i++) { if (DRT_HASH_TEST_BIT(cmap, index, i)) { fs = i; break; } } if (fs == -1) { /* didn't find any bits set */ panic("vfs_drt: entry summary count > 0 but no bits set in map"); } for (ls = 0; i < DRT_BITVECTOR_PAGES; i++, ls++) { if (!DRT_HASH_TEST_BIT(cmap, index, i)) break; } /* compute offset and length, mark pages clean */ offset = DRT_HASH_GET_ADDRESS(cmap, index) + (PAGE_SIZE * fs); length = ls * PAGE_SIZE; vfs_drt_do_mark_pages(cmapp, offset, length, NULL, 0); cmap->scm_lastclean = index; /* return successful */ *offsetp = (off_t)offset; *lengthp = length; vfs_drt_trace(cmap, DRT_DEBUG_RETCLUSTER, (int)offset, (int)length, 0, 0); return(KERN_SUCCESS); } /* * We didn't find anything... hashtable is empty * emit stats into trace buffer and * then free it */ vfs_drt_trace(cmap, DRT_DEBUG_SCMDATA, cmap->scm_modulus, cmap->scm_buckets, cmap->scm_lastclean, cmap->scm_iskips); vfs_drt_free_map(cmap); *cmapp = NULL; return(KERN_FAILURE); } static kern_return_t vfs_drt_control(void **cmapp, int op_type) { struct vfs_drt_clustermap *cmap; /* sanity */ if ((cmapp == NULL) || (*cmapp == NULL)) return(KERN_FAILURE); cmap = *cmapp; switch (op_type) { case 0: /* emit stats into trace buffer */ vfs_drt_trace(cmap, DRT_DEBUG_SCMDATA, cmap->scm_modulus, cmap->scm_buckets, cmap->scm_lastclean, cmap->scm_iskips); vfs_drt_free_map(cmap); *cmapp = NULL; break; case 1: cmap->scm_lastclean = 0; break; } return(KERN_SUCCESS); } /* * Emit a summary of the state of the clustermap into the trace buffer * along with some caller-provided data. */ static void vfs_drt_trace(struct vfs_drt_clustermap *cmap, int code, int arg1, int arg2, int arg3, int arg4) { KERNEL_DEBUG(code, arg1, arg2, arg3, arg4, 0); } /* * Perform basic sanity check on the hash entry summary count * vs. the actual bits set in the entry. */ static void vfs_drt_sanity(struct vfs_drt_clustermap *cmap) { int index, i; int bits_on; for (index = 0; index < cmap->scm_modulus; index++) { if (DRT_HASH_VACANT(cmap, index)) continue; for (bits_on = 0, i = 0; i < DRT_BITVECTOR_PAGES; i++) { if (DRT_HASH_TEST_BIT(cmap, index, i)) bits_on++; } if (bits_on != DRT_HASH_GET_COUNT(cmap, index)) panic("bits_on = %d, index = %d\n", bits_on, index); } }